Fumarole--I have found though numerous posts here over the last yeat that it comes down to preference more then anything else.
The RN4072 runs a little hotter then the 801's and the bridge on the RN4072 is a low arch shapped while the 801's bridge is pointed and higher. The only penstyle that I have scene over and over again get rave
reviews is the BE112 from BEST.
So wheather it is two holes, 4 holes, 3 holes, high bridge, or low bridge, they all seem to work well for the most part.
Sun