TextMate and Ruby

I'm an on and off [tag]Ruby[/tag] developer, and recently I've been trying to decide whether I should use Eclipse for Ruby development or whether TextMate (I am on a Mac) is better.

Why even think of [tag]Eclipse[/tag]? Simply that I know it well and it's very rich for developing Java. It's also cross platform. From my investigation though, Ruby support in Eclipse is still immature.

On Mac, TextMate is the hero of Ruby developers. But given that Ruby doesn't have a debugger and nirvana to Ruby developers is the interactive ruby shell, IRB, I'm not convinced yet.