I prefer the autoloader (1911 CCO actually) when carrying IWB. It's much thinner so it's more comfortable and conceals better.
However, if I can use other methods to carry, such as OWB or pocket carry, I prefer a revolver. It's simpler to use, simpler in operation and it doesn't use magazines or slide reciprocation to operate so it's generally more reliable in a wider range of operation (from a pocket, up against a body, etc).
I usually carry a lightweight .38 revolver since it's just extremely convenient to drop my alloy framed S&W 642 in my pocket. I can also drop my heavier SP101 .357 in my pocket but it's too big for some of my pockets.