I think you missed the original point here - the question wasn't "have you ever made a decision biased by your personal preference", but "have you ever knowingly chosen a bad solution, based on your personal preference".

My answer to that is "yes". I've recommended open source solutions, even though the MS ones would have been easier to implement. I guess my excuse is that I think the OS ones would have been easier to maintain and more secure, in the long run. But I have a sneaking suspicion that that's just an excuse, and wasn't 100% true at the time.

-- Dan