I'm a big fan of the Danish style pipes. What I like about them are the attention paid to the flow of the grain and the wild, exotic, organic shapes achived by the carvers. I also like the fact that no two pipes are ever alike, which lends a uniqueness to my pipe purchase. I haven't found Holm's pipes to be particularly superior to any other Dane carver. But, he was an early adopter and gets some credit as a founder of the freehand movement, which I suppose lends some points.
I'm not a clencher, so weight and balance aren't factors in a pipe buying decision. Since many freehand pipes are large ( and I have big hands ), how a pipe feels in my hand is of greater concern to me. I also have many sitters, so if I'm doing something that requires two hands, down it goes. A sitter is the best invention ever made for allowing one to have a big ol' freehand.
As for pipe engineering: I own some Holm pipes that are pretty and smoke well and some that are pretty and....really pretty. :wink:
The freehands that I have, either Ben Wades, Holm's, Bari's, Soren's, Erik's or Nording's are mostly big bowled pipes. It may be because I'm drawn to big bowled pipes or maybe Danes made pipes that tend to run toward the hefty side of the scales. I haven't done any scientific census taking on pipe bowl sizes so I can't say with certainty. I think big bowled pipes are harder to smoke. Its harder to keep them lit, harder to get an even burn though the tobacco, and harder to smoke to the bottom. I have some smaller Holm pipes and they smoke like any other pipe.
I guess I'm drawn to them for reasons other than smoking qualities as a primary concern.