I run a canister filter right off one airlift tube on the UGF and a power head on the other airlift tube. And to clean under the UGF, I use a turkey baster and work it through the gravel and pump multiple squirts through the little slits in the UGF, you should see the stuff fly up the air lift tubes, its like a manual RUGF. Ill do a 1/4 section of the UGF b4 each water change.
As for the question, I like them both, they work well in conjunction. They say the UGF's are old technology, they are, and also tested throughly. They Work!