It depends on your shooting situations. If you want to use the scope only (and no open sights) then go with the low base. Some say you get better accuracy out of a scope mounted as close to the barrel as possible. If you want to use both open sights and a scope, then go with the high or see-thru mounts. But again, some high or see-thru mounts touch the rear sight and it has to be removed anyway. So I guess whatever works best for you, use it. I prefer the see-thru as I hunt in a-lot of snowy weather, and sometimes it's snowing so hard, it's hard to keep the scope clean, so if needed I have the open sights to back me up. And being taller than most, 6'6", the high base or see-thru's work better for me with eye alignment. Good Luck. BP