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List of cards which support Free-Sync.

Curved VA panels have less sharp text than AHVA/IPS/PLS and TN panels:

IBXT Curved C24FG70 VA Text Blur Analysis
PC Monitors Curved VA Panel Text Blur Analysis

AUO TN panels tend to suffer from some degree of washout or contrast, gamma and uniformity loss at 144hz.  Read my post about AUO TN panel dark scene banding before reading this post.

If nearly equal performance wise I recommend 24-25" 1080p over 27" 1080p since the smaller panels have sharper text.

1.) Asus VG259Q (IPS)
2.) AOC 24G2U (TPV IGZO IPS)
2.) Asus VG279Q (AHVA marked as IPS)
2.) Acer VG271 (AHVA marked as IPS)
2.) Philips 272M (IPS type)
3.) AOC 27G2U (IPS)
4.) LG 27GL650F-B (LG IPS)
5.) Philips 278M6 (curved VA)
6.) AOC C27G1 (curved VA)
7.) MSI MAG271C (curved VA)
8.) Samsung C24FG73 & C27FG73 (curved VA)
8.) MSI MAG24C (curved VA)
9.) Viewsonic VX2458-mhd (TN)
9.) AOC G2590PX (TN)
10.) Viewsonic XG240R (TN)
11.) Acer XFA240 (TN)
12.) Acer XF240H (TN)

The Asus VG259Q is nearly perfectly accurate, uses a 25" IPS panel which tend to have less glow than 24 and 27" AHVA/IPS/PLS (based on my experience with the 4x HP 25" I tested).  The Asus has very fast pixel response times with minimal overshoot, even when using the default overdrive (Trace Free 60) setting, and has negligible input lag (9.2ms measured with an oscilloscope by PC Lab PL); more overdrive information required to provide more detailed comparison versus competitors.

The AOC 24G2U uses a Panda LC238LF1F IGZO IPS equivalent to LG IPS which is smaller and sharper than the 27" AUO AHVA panels in the Acer VG271 and Asus VG279Q, as well as offers equivalent gaming (low input lag and fast pixel response times) performance.  Due to a lack of reviews I can not determine if the AOC is superior to the Acer and Asus, however, the Asus is more accurate than the Acer, and the AOC is sharper than the Acer, and very accurate which is why the AOC and Asus are both ranked #1.  I can not recommend the AOC over the Asus or vice versa until more AOC reviews come out, and some may prefer owning a smaller 24" 1080p panel over a 27" 1080p panel.

The Acer VG271 and Asus VG279Q use an AUO AHVA panel (marketed as IPS) which provides the best balance between image quality and pixel response times since AHVA panels are free from color evenness and vibrancy reducing gamma shift, and have wider viewing angles than TN and VA panels.  Fast AHVA panels (marketed as IPS) like the VG279Q have significantly faster pixel response times than VA panels, and are usually only slightly measure-ably (with an oscilloscope) slower, and barely perceive-ably slower than TN panels.

The Asus VG279Q costs a bit more than the Acer VG271 and AOC 27G2U, Philips 272M, but is more accurate and the Asus comes with a height adjustable stand while the Acer and Philips doe not.  The Asus is the fastest followed by the Acer and Philips which are more accurate than the AOC.

The LG 27GL650F-B uses a matte 144hz LG IPS panel which is slightly slower and less accurate than the Acer VG271, AOC 27G2U and Asus VG279Q, as well as is less accurate than the Acer and AOC.

The  Philips 278M6 is very similarly to the AOC C27G1 and MSI MAG271C, but is slightly more accurate (versus AOC which is more accurate than the MSI) since it does not significantly over-saturate colors of SDR or non-HDR (HDTV/REC 709 and sRGB) content, offers equally as good overdrive as the MSI,  and back-light strobng (MPRT).

The AOC C27G1 is very similar to the MSI MAG271C.  Both use curved matte VA panel with much higher contrast, more vibrant and even colors than TN panels, and less bleed and glow than AHVA/IPS/PLS, but VA panels suffer from horizontal gamma shift, black crush in the center, slightly less sharp text than non-curved VA panels.  The AOC does not have an sRGB mode to prevent over-saturation like the Samsung VA C2xFG7x panels, and the AOC's have slightly slower pixel response times than the Samsung's, but also less overshoot ghosting.  The AOC C24G1 and MSI MAG24C are significantly less accurate than the 27" versions out of the box, as well as have lower contrast; the C24G1 can be improved by switching to the sRGB mode, but it locks the brightness and color controls, and cranks the brightness.  The AOC C27G1 is ranked above the MSI and Samsung VA monitors since the AOC has more balanced overdrive with less over-shoot, and is more accurate when the semi-wide gamut over-saturation is not accounted for.  The Samsung C27FG73 and C27FG73 also use semi-wide gamut VA panels which over-saturate color, but they have sRGB modes which prevent the over-saturation.

The Samsung C24FG73 uses a curved matte VA panel with much higher contrast, more vibrant and even colors, less bleed and glow than AHVA/IPS/PLS, and vastly superior image quality compared to all TN panels but it does suffer from horizontal VA gamma shift, black crush in the center, more overshoot ghosting and slightly less sharp text than non-curved VA panels. C24FG70's made before November 2016 suffer from very obvious purple overshoot ghosting when displaying some colors while the newer C24FG73 has a higher chance of coming with the overshoot ghosting reducing firmware (Source=Lims Cave).  The Samsung uses a semi-wide gamut VA panel with 25% over-saturation (125% sRGB), but it has an sRGB mode which prevents the over-saturation and does not de-saturate colors.

The MSI MAG24C also uses a curved matte VA panel with less overshoot ghosting and slower pixel response time than the Samsung's, and is less accurate than the the 27" AOC, MSI and both the 24 and 27" version of the C2xFG73 monitors.

The Viewsonic VX2458-mhd has a 48-144hz AMD Free-Sync range (limited to 120hz over HDMI) and has very accurate color presets, as well as very fast pixel response times with negligible overshoot ghosting when the over drive setting (Response Time) is set to Ultra Fast.  It does not suffer from the same horrific dark scene banding as the Dell S2417DG, S2716DG, and Viewsonic XG2402 (tested by me).  The VX2458-mhd's Ultra Fast Response Time setting offers superior overdrive to the XG240R PRAD tested: VX2458-mhd versus XG240R's best overdrive setting which is the Faster setting.

The AOC G2590PX does not suffer from the dark scene banding according to both PC Monitors and a Reddit G2590PX owner, and nor does the XG240R.  The AOC G2590PX suffers from contrast lottery (650 vs 1000:1), as well as can not fully cover the HDTV/REC 709 or sRGB color space, however, it does over-saturate some colors as well as under-saturate them. 

The ViewSonic XG240R suffers from gamma lottery and tends to have worse preset gamma than the AOC G2590PX and ViewSonic VX2458-mhd, but is still one of the best 144hz 1080p TN panels.

I did not check for the dark scene banding which ruins the Dell S2417DG, S2716DG, and Viewsonic XG2402 (tested after I tested the Acer) when I tested the Acer XF240H since I did not think of doing so at the time since I erroneously presumed the 24"1080p  AUO TN panels did not suffer from the same dark scene banding.

I removed the LG 24GM79G from my list the unit Belgium Hardware reviewed was very inaccurate, and because I don't know if it suffers from dark scene banding.