I can't really pick one or any of them.
I mean, Merman was the original. She was ROSE. It was designed for her. She sings it fantastically, and she owned the stage. From all accounts, she even acted the part pretty well. She's definitive. Tyne Daly really seemed to get the part at it's core. She best got Rose's desperation. Bernadette was a little more sexy and conniving. She was like a spider, not a tiger.
For me (FOR ME!! FOR MEEEE!), I think Angela and Patti come closest to a full package. Both them sing the score with the power and presence of Merman, but they also bring the acting that is equal to Daly and Peters.
But, we can never forget Betty Buckley actually "batting a thousand."
Some people paint, some people sew, I meddle.