That's a pretty broad question. Best for what? What type of scope are you using? What type of shooting do you do? Hunting, competition target, military/LE sniping?
I've always had good luck and been happy with standard milled steel Leupold bases and rings, and thats what I have on most of my hunting rifles. Although one of my rifles has Weaver rings and mounts. Personally I think shooters place way too much emphisis on rings and mounts, and spend way too much money on them than they really need to.
I have a friend who bougth some aluminum Leupold Rifleman rings and mounts to go with his Rifleman scope a couple years ago. He said they were pretty inexpensive and he hasn't had any problems with them at all.
Avoid detachables on anything but a safari rifle. If used on a long range hunting rifle, you'll be resetting your zero all the time.
“You don’t need that” my loving wife stated flatly. Hovering near her, sporting goods catalog in hand, I tried to counter “But look Honey, it holds 2150 cubic inches of gear”, as I tried to give her my best loving look. “Nope, you do not need to carry more gear – you have several packs already… if one of them is not big enough, take two” she stated and then fell back to attacking her Sudoku puzzle. Sulking, I moved back to my side of the bed and continued thumbing through my...