I buy all of the multiplats I'm interested in for PC
So far, I regret buying a PS4 as early as I did. I've basically just been playing Madden on it and using it as my new blu-ray player.
Bloodborne is really the only PS4 exclusive that I care about until Uncharted 4 comes out, which probably won't be until the end of 2015 at the earliest. Although WiLD intrigues me.
The XBone has next to nothing for 2015 in terms of exclusives. Yet another Halo game that 343 is bound to fuck up (The Master Chief Collection is supposedly a broken mess and arguably the biggest flop of the year) and probably another Gears of War sequel. That Quantum Break game that everyone is pumping up looks just like Watch Dogs except with super powers instead of hacking abilities.
As of right now, I'd say that the Wii U is crushing the shit out of both in terms of exclusives. Games like Mario Kart 8, Super Smash Bros, Super Mario Bros U, Bayonetta 2, etc.