There is Amiga Forever and AROS, in these horrid economic times, which you think the retro gamer is going to purchase?
AROS is no good for retro gaming, Amiga Forever costs money.
So, WinUAE seems the best choise in these horrid economic times.
Wasn't there some work in AROS to reimplement the Amiga kickstart ROM in open sourced code?
Something like the Atari people did with EmuTOS, which runs some of the games in the Atari ST emulators.