I can never decide if the Vong's my absolute favorite Dynavap but I sure do love them. They're kind of more of a platform than the others, with the adjustable->closable intake and multi-fit MP, and also its excellent performance wet or dry. That makes them more fun to try out different tips for different effects. From L, the Vong tip, Helix, Std Ti, M21, M19, Omni, and Ti M+:
My most used are the two Cocobolo Vongs with the M21 and Ti M+ tips. The M21 is very forgiving and adaptable and the Ti M+ is what the standard Vong tip should have been, flavorful, powerful, and less prone to scorching. Of course, this diversity of experience does not require a Vong stem for each tip, one Vong's probably enough. I guess. ; )