Rather it was the original Xbox or the Xbox 360 what made you decide to pick an Xbox?
For me I had been more of a Playstation type of guy for a long time, had the Original PS1 and got a PS2 when it came out and played that mostly all the way up until just about the last year of that generation when I decided I was going to pick up an Xbox console now that they were cheaper to play Fable and Halo: CE since I had never been able to play those games and had my interest for a very long time. I enjoyed the system a lot the visuals seemed much more detailed and all in all better than PS2 to be honest.
When this generation of consoles came out I just decided to go ahead with the 360, never have even bothered with getting a PS3 everything about Xbox 360 dashboard Xbox Live and the games just seem so much better than what PS3
has to offer, Just my opinion though.