I think Eureka. I feel like she really got by on sheer force of personality, but that doesnt mean it was a particularly engaging personality. She was just able to show vulnerability in a way Silky can't. And was willing to look stupid as a big baby in a way Silky would never.
But I'm not sure she was any better as a performer than anyone else tbh.
I mean, she billed herself as a comedy Queen but Nina West is waaaaaay funnier. Actually when I think back I'm not sure Eureka was all that funny at all.