I've had a variance of all three brands. All of them are really great sights. Running a fast Eddie XL right now. I think:
spot hogg sights are hands down the most robust with very bright (almost too bright) pins
Axcel has the best adjustments and dimmest pins, plus they just seem more fragile than the others.
HHA has the brightest pins (too bright IMO, you get a halo effect) plenty robust
MBG has the best pin technology on the market with the photochromatic hood (never have pin halo, it's like automatic rheostat). They are very robust as well and very affordable when compared to the others.
My conclusion:
on a once on lifetime sheep hunt, I'd have the hogg because it's going to be the last sight to fail.
3D I'd have an Axcel
Hunting in a blind (spring turkey) I have an HHA because it is stupid bright.
Anything other hunting, Montana black gold is the best hunting sight you can buy. I'll have an MBG ascent on a six inch dovetail for next fall.
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