So you're comparing the potencies over the time period of which A. Bene ends instead of the potency per GCD. In that case, I guess A. Bene win since you're reapplying the "Regen" sooner and getting the full benefit sooner than WHMs Regen. I find myself siding with Miunih's reasoning on why he prefers Regen over Aspected Bene. I'd rather spend the extra GCD casting another DPS spell.