This video compares the first- and third-person perspective when it comes to combat in Resident Evil Requiem. In the game, you can play in either vantage point for both Leon and Grace.
You can find the video comparison, with time stamps, below:
0:00 3rd-Person Combat
4:54 1st Person Combat
Generally speaking, first-person is better when it comes to aiming. With that said, third-person is better for melee attacks in addition to being easier to move around the environment.