I'm not sure I actually have a favorite color, I like most colors, but have favorite shades!
I love anything dun! Of course you can't beat the right shade of grulla! But I have to say that since my horse is grulla.
But I'm also a big fan of golden palomino, not generally into chocolate, or really pale,
I love, love, love buckskin duns!
I like bright red bays with high black stockings, I like bright colored flaxen sorrels/chestnuts, a nice shiney black is always nice!
If I 'had' to pick a favorite, I guess it would be either grulla, palomino, or buckskin dun.