wii might be cheaper so to a person looking for the cheapest and quickest package the ya they will get the wii
but..
for a person that does research and wants more for there buck and something higher quality then they will choose the ps3 and im pretty sure most people know the ps3 is a blu ray player...soooo for $100 more you get blu ray, hd games, dvd upscaler, free online i think its easy to choose imho.
but it really depends on the consumer so i have no clue, thats just my opinion.