Both.my opinion,.. mult-console ownership is overrated. i had wii, ps3, xbox. 2 of the 3 just collected dust. too much of the library is the same. yes, missing a few exclusives sucks but there are sooooo many games to play on any one machine it isn't worth it to get hardware to play 2-3 exclusives.
Xbox One has been the only system I've skipped since I got into gaming. Since xsx has full bc, I figure it's a good way to play the few good games I missed. If Halo looks bad though I might end up holding off. That's what happened last gen.