I don't get it... best at what? Price, performance, maintenance cost, weight...???
You really want to narrow down the necessary n forget bout the good to haves.
1. Servicing costs/parts availabily is the most important for myself.
2. Performance/durability and parts longevity.
3. Suitability for diving in hash conditions from cold to muck n silt.
4. Finally, costs
If you intend to do wreck n tech, you're better off getting a tough, easy to service n proven reg.
The Apeks DS4/XTX50/XTX50 (which a lot of BSAC divers I know use),
Aqualung Legend and legend Lx which I personally use
Scubapro MK17/G250V which a lot of guys here use too.
All are fully capable and reliable regs and will be more than enough for most diving.
Lastly, as much as I like Atomic fins/masks, their regs although the best performing are also some of the best (highest) in servicing costs and servicing isn't that easy to find at least here in Asia. Should something go wrong during your travel... not a good thing to think about.
SangP