Not sure that I have any favorites, but my Northern Briars stack Dublin is my go to pipe for Virginia flakes. I have a 1930's Dunhill chimney that also does flakes well; a deep Barling's Guinea Grain Oom Paul for a long smoke, and a small Charatan Special Pot for short ones. My Fernsdown REO bent billiard is an excellent peice of workmanship. I have 14 Peterson pipes as well, and smoke them all, though not all the time. All of them smoke great, and once I find a tobacco that goes best in each, I dedicate the pipe to that style. Like my children, I would be hard pressed to select a favorite.
The draw on my Northern Brairs pipe is great, as is my Dunhill. The others flow well, but are a little more restrictive.