Mark,
If you're imaging at 770mm FL then I reckon either would probably do a decent job. I'm not personally familiar with the EQ6Pro but they seem OK, maybe with some tweaking required.
If you ever intend to use a heavier scope and/or longer FL then the A-P mount will just eat it up and the EQ6Pro will probably cause you grief (one option to fix this may be an AO unit).
I'd go for the AP1100 in a heartbeat. I prefer to spend the extra money to get good results quickly without pain and suffering but some people are masochists
Cheers,
Rick.