If you think that AHVA has got a higher contrast ratio than PLS, you're mistaken. They're both around 1000:1, IPS-like monitors cannot reach anything higher, without using pixel dimming found in TV's using IPS panels, no monitors use dimming.
For accuracy, always go with a 100% sRGB VA, they beat IPS everytime in every test but viewing angles. However, the vertical viewing angles for both IPS and VA are both horrible, a common misonception. IPS (or IPS-like) does have much better horizontal viewing angles though, than VA.