Richard Drummond's UAE Port has superseded MaxUAE pretty much. Richard's UAE versions are using core code from the recent versions of WinUAE so are inherently a lot more up to date. His aim is to make a UNIX/Amiga OS version that has all, or at least most, of WinUAE's features. The OS X version of it has no native graphics support currently however so, as I said above the graphics are slow, but I think the core emulator is doing OK. I would have thought it was a lot faster on LinuxPPC, AOs or Linux_x86 as it has direct graphics support on those platforms.
As well as updating the chronically dated UNIX version of UAE, this project will also provide an up to date version of UAE for Classic Emulation on the AmigaONE when AOS 4.0 is released.