Both those games have the same system requirements, although, to my eye, Horizon looks like the one with the most advanced graphics. -Someone was able to run it successfully on my graphics card (rx 570) with medium to low settings, although with a faster processor
The games look appealing, although I doubt I'll be buying any action games soon. Right now I'm in the mood for more relaxing games, and I'm currently playing Civilization V.
The good thing is Sony has decided to port some of its titles to PC. Sony can't refuse PC gamers' money. The competition with Microsoft may be another reason for that decision. In my opinion, only Nintendo does have "true" exclusive titles that people buy its consoles to play them. Playstation and Xbox exclusive titles are not "must-have" anymore because there are dozens of similar titles on PC.