Buckle is definitely quieter putting on and off and does not make the scratching sound when you draw the bow.
If you shoot with a loop they you should really try one of the newer hook style releases out today. They are wonderful to use with a loop. No more having to look at the loop to make sure it is hooked up properly, gives a cleaner release than caliper style releases, much less wear on the loop.
I have been using a Scott silverhorn for three years now and will not go back to a caliper style release though I do still keep my sabertooth as a back up.
The Rhino XT which is another excellent choice from Scott.
Tru Fire makes the hardcore which self centers to the pressure applied to the hook.
TruBall makes a couple nice ones as well... the beast and beast II.
Spott Hogg wiseguy
"The danger to America is not Barack Obama but a citizenry capable of entrusting a man like him with the Presidency........... Blaming the prince of the fools should not blind anyone to the vast confederacy of fools that made him their prince. The Republic can survive a Barack Obama, who is, after all, merely a fool. It is less likely to survive a multitude of fools such as those who made him their president."