I already got GTA V for the xbox360. What are some big differences between the one for the previous gen and current/next gen except for the firstperson mode?
I already looked at these 2
http://www.ign.com/wikis/gta-5/GTA_5_Xbox_One,_PS4_and_PC_Differences
http://www.primagames.com/games/grand-theft-auto-v/feature/gta-5-next-gen-5-reasons-youll-buy-it-again
Honestly? 60fps.
Although the game looked stunning on Xbox it was capped to 30fps for obvious reasons. The PC version does run with more. I use my laptop GTX 870M and I do get about 60-70fps on high settings.
Apart from that, online play doesn't cost unlike on XBox where you need Xbox Live Gold, so I also thought of rather investing the money here than 1 year online subscription there and enjoy the game for more years for free.
Another big pro is the video editor, you probably saw some real good work already and it is, to my surprise, so easy to use.
Online play is smooth, I didn't encounter any real bugs apart from the starting probs I had. But it wouldn't be Rockstar if it went smoothly for everyone.
If you want it badly, I say invest, it is totally worth it, from my perspective. If you can still play on the Xbox and those features aren't too much of an interest to you, you should probably wait for a discount (sometime around wintersale I guess)