Going to come down on the side of small scopes for the QB's. Tried three yesterday, and the short lite scope does make loading a little harder (not a whole lot...not eough to matter to me) but fit the use of the rifles well. Will leave the long scopes on the heavier 2078's as they seem to compliment the balance rather than distrub it.
In the AM tried an older Simmons 6-18X:

Settled on a little 6X with paralax adjusted to 30yards.

Are lots of combinations that will work...the QB has a long reciever and will accept nearly any scope....but how you'll use it really decides what scope is "best". This little rifle gets used for hunting, and for that use the little 6X is still a compromise...might try the same scope in 4X.