New games prefer the Ps4 version instead of the Ps5 version?

Ac Valhalla for the Ps4 e.g. Get a free upgrade for the Ps5. Since I'll be playing the game on the Ps5, but my brother will stay on the Ps4 for the time being, it makes more sense if I get the 5 version, doesn't it?

I can then borrow it later and play the 5 version.

If you get the PS5 version, he won't be able to play it on the PS4. To do this, you have to get the PS4 version.