Cleon
Legend
But I assume that 5E abilities probably more than make up for this?
EDIT: Grammar correction.
5E Devils tend to be a lot simpler mechanically than their AD&D versions.
Power wise it's hard to tell since the game mechanics are rather different, but the nastier 1E monsters tends to be a worse proposition than their 5E incarnations if only because AD&D monsters tend to have more unpleasant special abilities (as in save-or-die and save-or-have-a-life-made-of-suck-that-usually-ends-quickly attacks).