Howdy,
There seems to be a bit of confusion here as to what a 1/4 pitch chain really is. This is caused in part by the fact that the 3/8 low profile design chains, such as Oregon 91 series or Stihl PM are initially 1/4 pitch cutters on a 3/8 chassis. True 1/4 pitch chains have so darn many cutters that they are a considerable nuisance to file, and unnecessary unless you are an "in the tree" arborist. The do make a cleanner cut with less grain tearing. They are also the best for cutting bamboo. True 1/4 pitch chains are far smoother on the very small saws (less than 1.9 cu.in.). The old normal sequence 25AP was the fastest chain on these very small saws, as well. The full skip chain, which is now standard, I believe, lost this advantage. Windsor had a good version of the normal sequence 1/4 pitch semichisel chain. I'm not sure if it is still around.
All that said, I must mention the .043 gauge (narrow kerf chains). I have had only limited experience with these since I promptly gave up on them due to the fragility of the chain, as previously mentioned. Also, I failed to find any cutting speed advantage if things are properly filed. There may be an advantage on a prunning saw application, but not if there is much of any cross section of wood to be cut.
Regards,
Walt Galer