Those 2 games play a lot differently. WZ plays faster and feels...well like most CoD games of late. Pubg is slower and I'd say more realistic but probably less fun. I'd watch some YT gameplay vids and see what you think.
Warzone runs way better on my PC and I find that the game features and mode diversity make it way more fun. I suffer a major disadvantage in PUBG because I always have to have the graphics on the lowest settings and my view distance ends up getting cut. Turning around lagged heavily and even when it was playable, the lobbies consisted of mostly tryhards and sweats.