Yes I would have to admit to having brand loyalty to certain manufacturers (Toyota, Honda, Sony, Panasonic, HP, Benchmade, Kershaw, and Gerber to name a few), mainly because my experiences with them has typically been positive with few if any serious problems. As far as gun brands go I am still a fan of Colt and S&W, though they've had their share of clunkers along the way. More than likely it goes back to when I was growing up and these two were basically "it" when it came down to semi-autos and revolvers. You wanted a pistol in .45 then you went looking for a Colt; likewise if you wanted a revolver, then S&W was your go-to manufacturer. Sure you could have strayed from the beaten path with guns from Star, Llama, Astra, Manurhin, Steyr, Walther, and Springfield Armory; and for their part they were all decent guns. Still I always came back to Colt and S&W.
Nowadays I have quite a few more brands to share the wealth with (HK, Ruger, Browning, SIG, Beretta, CZ, Kahr, Mossberg, Uberti, and Pietta), and as long as their guns are well built, reliable, durable, and accurate I'm going to remain loyal to them as well.