it can depend on what rest and conditions one hunts with, many of us here either use the Balzer or Dravane Savage four inch vanes, the Savage vanes are a little stiffer and durable for rests like the Ugly Cookie [WB]
We also have a lot of wind and in our tests the four inch are a little more stable at longer distances that we have to shoot in wide open areas,
Having said that I would have to say Blazers are the most popular vane hands down, the ingenous bowhunter that invented or designed the Blazer is a good friend of mine, and I know why he devolped that design and it makes sence.
JMHO
Neil