The Wii is attracting a large customer base because it is cheap, they have exclusive games that are actually FUN and it is focused on one thing: gaming.
Personally, when I looked at the options, I wanted to get the most bang for my buck, so the PS3 was the clear choice for me. The most powerful hardware, the best graphics, great games, online connectivity & gaming, media streaming, a Blu-ray player and more! From my perspective, it was no contest.