I agree with Kentucky, for me it depends on the individual knife. I would not like my Buck Vantage as an AO, but I love it the way it is as a manual, but I do not think I would like my Benchmade Nitrous Stryker as a manual...
I like just about all flavors of knives, it just depends on the knife and the day. One thing that is nice about AO and autos though, is when you have a deep slice on the end of your thumb tip. A couple of weeks ago I managed to slice both thumb tips pretty bad when modding a couple knives... It really made it a pita to open certain knives.