I had both, I actually bought the F200 and the Caanoo at the same time. I ended up selling the F200.
The Caanoo is faster, the problem is, not all emus are ported over. So you have to use GINGE for running some of the old GP2X emus and some times they don't even run.
Amiga emulation is much better, but The port of Vice is quite shitty, someone needs to do a proper job. I haven't tried Atari ST though.