Well I think they prefer the 3-phase for conversion. The single phase will work but you have to tear into the coils to make a some other connections and it is kinda difficult.
These motors have to be converted to be a good generator. You cant just through a set of blades on it and stick it in the air. If thats what you want to do, find a good D/C motor. High voltage--Low R.P.M. Thats what I'm using.