I have both, the airbleed carb is better, it has a metering slot in it so the barrel does not slide in and out as the barrel rotates. I use a filter since the fuel metering slot is very fine and could clog easily but never has. I use a .40 sized Irvine JetStream carb on my Dieselized Fox .74, it has a fat spray bar and offers more fuel draw at Diesel rpm, plus with that carb I can run it wide open.