Years ago I listened to a Yahama salesman.. had I needed a Generator I would have gone with him but now days.. I am not quite as sure.
Arguments:
Hondas are very populer with the 5 finger discount crowd.. Yahama's being a different color, are not so much. However proper security can cover this.
Yahamas use higher quality main bearings on the engine crank shaft.. Theory has it this means they will last longer.
Honda's have a genuine FUEL PUMP that can suck gasoline out of the tank.. This means you can get an "Extended run" tank for the Hondas it is a kit considting of a 2nd (I think larger)fuel tank and a special Gas Cap with connecting hose, as the pump sucks gas out of the MAIN tank it is sucked out of the Extended run tank... Hondas have a fully sealed gas tank (unless you open the vent which is in the cap) (If you want to know ask)
For MY Needs a Yahamna 1200 is ideal.. Or a Genrac 1000 (Which I own if Iever find it).
But if I want A/C well,. that job belongs to Mr. ONAN, (I need one that can just power my battery charger, NO MORE)
But if I were buying for use as the primnary generator.. i'd seriously consider the Honda due to that extended run feature.