Well it depends what you mean by "better". W/L ratio. Title reign, income, strength of schedule?
If the goal of your career is in any way tied to fame, records, or money the answer is Conor.
If it's to establish yourself as the best in your sport in your class it Aldo.
Pretty much anything else is BS or subjective.
So please explain why Conor starched the best in his class in 13 seconds, destroyed max and stayed undefeated at FW.
Then won a WW
Then won the LW belt
Erm......ok