For stock load the stock generator should do well.

HOWEVER you are talking about added load.
You therefore may need more generation whether generator or alternator is now the question.

Generators are more maintenance than alternator ASSUMING same quality

Alternators are a bit more tolerant of dirt and water ASSUMING slip rings.
IF brushless excitation then they are almost immune.

From my experience as an industrial electrician AC is generally the first choice over DC any day - there are exceptions but they dont apply to vehicles.

The next choice is 6 or 12 volt. That is made probably on personal preferance cost and availability (on a daily or 3 day basis) for replacement parts.

Dan Bentler