"Best" is kind of hard to pin down. It depends.
Highest quality, removable and replacable while holding zero?
PROBABLY Larue...
LaRue Tactical SPR / M4 Scope Mount QD LT-104
I am very satisfied with my Nikon M223 mount which matches my Nikon scope but it is not quick detach (I don't need it to be).
It all depends on the scope, the intended use and whether or not you can budget the "best" or just need the good quality, adequate tool for your needs.