I have a Dunhill, Comoy's, Butz Choquin, Brebbia, Lorenzo, Kaywoodie, Dr Gragow, Wally Frank, Ropp Cherrywood, a few LHS, and many others...my best smoker is a Canadian with a patch on the bowl's bottom and a meer lining by St. James.
I don't really have enough experience with the various factories to form an opinion as to which I like the best, but right now it's the Brebbia and the Lorenzo I enjoy smoking the most. (I haven't smoked the Dunny since I got it restemmed, nor the Comoy's, cuz I'm saving it)
A good smoking pipe is one I pick up w/o fear of gurgle or relight. It tastes good and feels good.
I'm looking forward to trying some more 'brands' and makes. It's been a rather haphazard time of collecting these for me because I just started last spring and I have obtained all my pipes but one from Ebay auctions.
I will say that it's been fun as heck learning about them.