Aspected Bene has a total potency of 1030 where as Regen is 1050. Regen is also cheaper than A. Bene. I'm not sure where people are getting the idea that an unbuffed A.Bene is stronger than an unbuffed Regen.

150 * 7 ticks is 1050 potency (Regen)
vs.
140 * 6 ticks + 190 is 1030 (A. Bene)