ARexx scripts would often break under emulation when I tried it a year or so ago. When that situation is resolved, I'd say emulation is superior, but there's something intangible about running real Amiga hardware. That's something emulation will never be able to replace.
My opinion would probably be different if it weren't for my CSPPC. When that goes I'll probably lose my interest in using my Amiga unless newer mass-market hardware shows up. Let me know when I can start holding my breath. ;-)