Halo. I actually got an xbox late since I was Sony before that. I got my xbox right before 360s and ps3 were released. At that point, I got ps3 on release day and didnt have an xbox360 for a while...I also only had dial up for most of the time like when halo2 was big.
Then I was old enough, and bought 360/ps3 real internet etc...Now I'm here with a xb1 that i picked over ps4 for halo...I'd only get ps4 for a baseball game or metal gear solid, but since xbox got MGS, easy choice. I do miss my baseball game though, but when ps4 becomes 150 or 200 I'll get it.