Since you said what Microsoft consoles they already had (thanks for adding that in this time), you should recognize that your sample is biased. Since "many more" had an X-Box, then you've already started with a sample that's biased towards preferring the 360. This limits what you can conclude from your informal survey.
As a follow up, what games have the Wii owners tended to play? I would guess that they haven't played many of the great single player Wii games (Trauma Center, Metroid, Zelda, several VC games). If many tend to like the games that the X-Box/360 tend to offer (namely FPS and sports games) then it's clear why they would prefer it over the Wii (until more developers put out quality games like MoH Heroes 2 and Madden on the Wii).
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Since you said what Microsoft consoles they already had (thanks for adding that in this time), you should recognize that your sample is biased. Since "many more" had an X-Box, then you've already started with a sample that's biased towards preferring the 360. This limits what you can conclude from your informal survey.
As a follow up, what games have the Wii owners tended to play? I would guess that they haven't played many of the great single player Wii games (Trauma Center, Metroid, Zelda, several VC games). If many tend to like the games that the X-Box/360 tend to offer (namely FPS and sports games) then it's clear why they would prefer it over the Wii (until more developers put out quality games like MoH Heroes 2 and Madden on the Wii).