It's interesting - well, at least to nerds like me - to compare L&H to A&C.
First would be their "team" name: Stan, the "funny" man, had first billing ("Laurel and Hardy"), whereas the "straight" man Abbott was first in their team ("Abbott and Costello").
They all had their dark sides in real life - the classic comedian afflictions.
To me, Abbott was always far more abusive of Costello than Hardy was of Laurel. It's like comparing Punch and Judy with Mr. Rogers.
And I'm sorry, but for raw talent and vaudevillian ability I give the nod to Stan and Ollie. They had greater ranges and are more frequently recognized world-wide than Abbott and Costello.