I voted C for Amiga for the simple reason that I'll be switching over to AROS 68k as soon as it is practical to do so. The legal gibberish that is going on with regards to OS 3.x is just insane. Not to mention that AROS is still actively developed and has several features that are lacking in the original AmigaOS series.
That said, the code quality of all the 68k compilers I've ever tried is abysmal. If I had the choice, I'd use AmigaE instead of C but the AROS source codes are written in C.