If you want the best looking version with the best content= vita version.Oled makes the game look great and the pixel density in terms pixel/distance to screen is the best.
If you can't wait :buy the ps3 version
If you can wait:ps 4 version.Games on new systems are in a subjective way always more fun(just because the system is new) and the new system needs your support and the publisher will release more games if they sell a lot on a new system
+ the price should be a budget price(don't expect it to be more than 40bucks new on ps4
Most likely they are gonna sell it for 60 bucks don't you think?
40$ would be my guess too. Or a lot of new content for the next gen consoles. Ubisoft isn't that crazy to release a game half a year later when there are 4 platforms already available with price probably around 30$ or lower and ask 60$ for it and expect anyone to buy it.
if it is 40, that is really tempting for me because i prefer to play my games on ps4 now but again 3-4 months away. it is hard decision
That's my plan as well, buying multiplats on PS4 from tomorrow/ now on. I will get Legends on the Vita though, like me some 2D platformers on the go
I can't guarantee it will be 40$, it just my guess based on best logical reasons.