As much as I would like them to tell the truth the only thing you gain from the #'s OT throws out there is their "3000" will be brighter than whatever they label as "2000"
OT makes good lights, but the #'s themselves might as well be just apart of the model #, they have zero real world value.
I'd trust DGX all day long with their #'s. I have both DGX and OT lights, they're both great. It would be impossible to compare the 2 without personal experience or reviews like yours, so kudos for sharing!
I'm currently rocking an OT D630, which is overkill for most of my dives but it's brighter and lasts longer than I'll probably ever need. I might go 6 weeks between charges, usually running it on low for my ~ bi weekly 1.5 hr dives.
Cheers Stuart, we need to catch up soon!