Some of the VR games looks really cool. I'm thinking on buy the PS4 VR, would that be a good choice or do you think that I should go for another VR system? Which one?

I have a Vive since release. I wouldn't get a PSVR(low resolution, small range of movement limits gameplay options, doesn't really hit the mark of what makes VR so appealing).

There are a handful of games that are absolute gems that nail the experience within a pretty narrow range of genres. AAA games are coming(see Fallout 4 VR), but expect to see a lot of stationary shooters(Serious Sam, Space Pirate Trainer) and early access games that are somewhat thin on content and have worrying update roadmaps. Personally I think its best as a social activity, mine gets used most when I have people over for VR parties because its just as much fun to watch someone play as it is to play yourself and its usually best to play in short'ish sessions(I tap out after an hour max usually).

Vive is probably a $1500+ investment if you don't have a capable gaming PC already. I definitely have not used it enough to justify the $800 I paid for my Vive(already had the gaming PC), but its $600 now and I'm not mad that I bought it because its fun to share the experience with friends and everybody seems to get a kick out of it.

Edit: should note that I haven't touched my vive in about 4 months because I moved and I'm still working out a good play space in my new place and have been too busy to host people. I'm not really familiar with any new releases in the last quarter.

PSVR is 80% of the resolution of Vive -- of course it's worse, but they're basically in the same tier of early options.

Pimax is soon coming out with a headset with 4k resolution per eye (they're calling it 8k which is kind of dumb) -- this might be worth waiting for if you're starting to consider VR. It'll be around $800.

Roomscale is the real difference maker between PSVR and Vive/Oculus. aside from "cockpit" games I don't see the appeal of seated/stationary VR, especially with a control scheme that uses a gamepad.

Well, the biggest appeal for any of it is looking around at a virtual world, and that's the same no matter how you're controlling yourself.

When I think of how and where in my place I might set up roomscale operations for VR, it seems as though that, too, would be clunky. Admittedly, though, I haven't looked into accessories for VR systems such as vive. Are you really walking around in a room doing things in the game?

Yes.