XB1 has a big list of backwards compatible games, look it up.
What kinda games do you like?
XB1 is getting better now with games like R6 Siege and Rocket League out now and The Division out soon. H1Z1 comes out for XB1 next year too. Plenty to look forward to! Make sure you get whichever platform you have the most friends on. I dont have PS4 because i only know 2 IRL friends with one.
A lot of games now aren't being made for old gen. for example.. division, r6 siege, cod (no campaign on last gen), destiny 2, star wars battlefront, list goes on of next gen only games