Well... Rather than say what "one" is best (Oh THAT word again !) by only having used...only one brand...
I've use BOTH of the EAGLEVISION...AND the UTG brands.
I don't know what the good folks on Amazon or other.."no-name" brands sell, but you can bet, a few more cents, is WELL worth the "better" choice.
By a FAR margin, the EAGLEVISION is much better made, much better machined (more accurate), and overall, a MUCH better fit on every 11mm rail that I've fit them to. Rifles and or pistols, no matter which.
Matter of fact, I just bought two of the "long", EAGLEVISION adapters on Friday.
Mike