My own because any brand can take a 180 degree turn from what appeals to me (usually via a creative director switch). Plus I greatly enjoy the creative process. (My answer would have been quite different a few years back though).
That's a tough one. I love Louis Vuitton (thinking classics like Speedy, Neverfull, Artsy), but I also love Coach (thinking Rogue, Ruby, Field Tote.). LV would probably win out, though.