I'm agnostic in this . They all have the same type of circuits and both have +/-.
Holleys have power valves that leak or blowout and the carb has to be pulled, drained and flipped to change, the Carter metering rod setup is bulletproof and easy to change. Changing the jets on a Carter can easily be done with the carb on and no draining of the fuel bowls is required.
The secondaries are easy on a Holley, esp if you have the quick change upgrade for the vacuum dia. The AFB carbs have issues with the secondary being a PITA to adjust, the AVS Thunder carbs are easy.
Comparing a DP Holley to an AFB/AVS is apples =/= oranges, they were designed for different purposes. Saying a DP Holley is better on the track (drag race) than a vacuum secondary carb of any stripe is really a no-brainer.
If there is a significant HP difference then carb is defective, poorly calibrated, or otherwise mismatched.