I'm in a similar situation. I have an xbox one already with MKX and KI so i'm covered there. But I also really really want SFV. I was also planning on getting a new laptop soon anyway, so I was leaning towards getting a nice gaming laptop. I occasionally play on fightcade as well, and I don't really see myself getting any other ps4 games at the moment. None of the console exclusives really jump out at me, but it seems to be the console of choice for fighting games. Any advice is much appreciated.
EDIT: I also use stick for SF and my only stick is an xbox 360 madcatz fightstick, which means I'd also have to get a converter or a new stick for a ps4. So I'm leaning very hard towards PC version but still would like any advice you might have.