Here's some others. Cool points if you get the shows...
Bailey or Jennifer? (Bailey, btw, is the right answer)
Jody or Terri? (Jodi, though really both are so full of win)
Jane or Ellie May? (*snicker*)
Lets see what wiki says:
Ginger or Mary Ann?
The question of which one men prefer has endured long after the end of the series. The question has inspired commercials, essays, videos, etc. By most accounts, the wholesome downtoearth Mary Ann has outpolled Ginger by a sizable vote. Bob Denver (aka Gilligan), admitted he was a Mary Ann fan, and that when producers did polls, Mary Ann always beat Ginger, usually three to one. It has been cited that this angered Tina Louise (aka Ginger) greatly, who received only half the amount of fan mail that Dawn Wells (aka Mary Ann) received weekly. According to Bob Denver in a 2001 interview, Wells received 35,000 fan letters weekly, whereas, Ginger may have got 1,500 or 2,000