both generators can be paralled with a matching generator.
both can use the parallel kit but Honda has the Companion unit, which eliminates the need for a separate kit.
i've heard that the Honda has a fuel pump while the Yamaha uses gravity-fed.
this comes into play when you want add an external fuel tank.
other than that, there's not much difference that i know of.
as was said, as long as you have a good 3-stage converter in your trailer, just plug the shore cord into the generator. using the generator's 12v cables to recharge the battery, is the second worse way to recharge them, next to using jumper cables from a running tow vehicle.
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC