Depends on the game. If it is an online game and most of my friends are on PS4, they I go PS4. If it is single player or a game my friends are not getting, I get it for NX. I want to support Nintendo in having a healthy HW business to go with their excellent SW so NX will be my normal 3rd party purchase system. And since I refuse to buy Neo or Scorpio, it will likely be the most powerful anyway.
I will not support shoddy ports though, so balls in your court 3rd party.