there are many good stand ups. It comes down to your tastes, age, and what makes you laugh. If you have children, chances are you'll enjoy comedians who incorporate their own experiences into their act. If your older you may prefer trailblazers like cosby, pryor, carlin, murphy, a younger fan enjoys acts like dane cook. Do you want a clean comic who doesn't need to drop f- bombs all the time to be funny or someone like bob saget? Do you like impressionists, observers, storytellers, musical acts, one-liners, etc.
There are lots of good stand-ups not named sean cullen!