Overall, the version on Steam/PC will have more content since it has more users and had about a 1 year head start before the PS4 version was released. It will also have more memory capability as well in terms of wrestlers you subscribe to and MP3 themes you wish to add to the game for entrances.
A couple things to keep in mind though.
1. This game is more simulation and logic based and requires a small learning curve to understand the mechanics. Luckily, the in-game challenge modes will give you a small tutorial regarding some stuff and there are plenty of guides on this forum that will help you understand some of the more in-depth parts of the game.
2. While you can play using your keyboard, it's highly recommended you use a controller regardless of console. The PS4 controller will do fine in a pinch if your computer recognizes it and that should not be a problem with Steam's controller compatibility.
3. When you subscribe to edits on the Workshop, please be aware that some edits will have parts, moves, etc. that require certain DLC to download and use properly. You should be aware of this though if you played the 2K games.
Regardless of what you choose, have fun and welcome to the forums.
Thank you for the response. To follow up, The mp3 themes so I can basically get the warrior coming to the ring with his music? Can I make it run like the nut job he was?
Also for the controller I thought some people were having trouble with the ps4 controller?
Last question. For the downloads. When i download stuff for my cities skyline game it tells me the extra stuff i must get for it to work does it do the same for this game?
Thanks in advance.