I own both with all the sensors you can get, even a custom M7 sensor someone put together. Use to own a Forcht Autodrive as well. They both have their pros and cons.
There is no real adjusting the index speed on the Ammotbot its just FW speed and RW speed. Where you can adjust all of that on the M7. You get a lot more sensors option on the ammobot, plus the case extractor is sweet for processing.
Currently I process on the AB and load on the M7.
The Forcht was a dumb autodrive with no sensors, it was an older model so dont take that as a slight he has greatly improved his automation but it is not as good as AB or M7, but it was very damn smooth considering he is basically converting the S1050 to an RL1050. My AB is on an OLD RL1050 and its a great machine. I'm happy I got the RL instead of waiting for a 1100. No warranty but who cares.