I voted for "other". Pinto and Appaloosa are not really colors, they are patterns. I LOVE pintos, and that is what I mainly breed for as far as pattern vs solid color is concerned, but to choose a favorite solid color, mine would definately be a nice creamy/smutty buckskin!!
It is hard for me to pick just one, but some of my favorite colors are grey, silver dapple, silver bay, palomino, buckskin, bright bay w/ white... I should probably just say I love almost all the colors minis come in!