Genny is slang for "generator". I have a 5.5 kw Onan "genny" in my toyhauler, so I am not very knowledgeable about the smaller portable units, My perception from camping with folks that have (typically) 2,000 watt Honda generators is that they are mostly used for battery charging and running a coffee pot or a hair dryer. A 2,000 watt unit might run a 13,000 BTU AC unit, but I think they would be hard pressed to run a bigger unit for any length of time. As far as which is the quieter unit, you can look at the manufacturer's claims.
