i have such limited experience with regulators.. but... so far, my Apeks ATX 50 and ATX 40 with DST and UST first stages respectively are my favorite
my first reg was a Dacor Fury and a Sea Elite Octopus ... the octopus was a joke, but
the Dacor wasn't bad
then i moved "up" to a Sea Elite Tech, which I understand is a clone of the DiveRite RG1200 (?) which is a clone of an Apeks reg ... the Tech was alright, better than the Dacor
then I got the Apeks, and these guys are noticeably better than the others
but that's all my experience