Both are equally good. Honda has a generator with a 30-amp receptacle built into it which is handy and the provision for easily adding an external gas tank for longer run time without having to add fuel to a hot engine. Yamaha has at least 5x as many dealers that are able to service a generator if there is a problem or needs servicing of any type.
First determine how much generating power (peak and operating) and then size the generator that is needed. I would sooner buy a 200, 2500 Watt or 3,000 Watt single generator than two 1000 Watt generators though the weight may be more than I want to lift with a single higher capacity unit.
Both types are going to be quieter than the average generator and safer to use with electronics attached.
