Metrowerks has a freaken great compiler- it's fast- uber fast. But it's editing for objective-c just absolutely blows. It doesn't even have function popups for it, and it's had an obj-c compiler in it for a couple of years now. GIVE ME A FREAKEN BREAK ALREADY.
Project Builder is slow- but it works. And a new version that will probably be out shortly has dual processor support, so I can compile multiple files at once, which is nice since I have 2 processors on my box. And it's debugger is a bit better when it comes to obj-c code too. And it's free, which is nice. But it's realllllly slow compared to metrowerks (well, gcc is- which is the compiler it uses).
Bah. Stuck between a rock and a hard place.