Blue Moon. My wife says it tastes like Fruit Loops. I don't know but I do know that as a kid, a local ice cream shop made it and it was the only place that had it. Or at least the only place I knew of that had it. Now it is available in the store but I can only rarely have it as a very special treat.
I would much rather try to answer an easy question like "which gun would you never sell?" or "what is the best caliber for bears?" or "how many different ways are there to be annoyed by thread drift?" than try to pick a favorite ice cream.
I have never met one I did not like. Period. (Doug, where I can find me some of that broccoli-and-lima-bean?)
But if I ever find myself on Death Row, and that "final meal" question comes up, I don't think I'd want to have missed one last taste of coffee ice cream.
It's hard to pick one favorite. Butter Pecan, or chocolate or strawberry cheesecake or vanilla. I've only had a couple scoops in the last month trying to loose weight. My dog has some every night or she will drive you nuts.