Had a big generac in our previous house (4500 sq ft.). No problems that I recall. I can’t remember for sure what brand motor it had but for some reason I want to think it was Kohler. These days, they probably come strictly with a generac branded motor, just a guess though.
We have a Briggs & Stratton in our current house (3200 sq ft.) that has a B&S vanguard motor, which is supposed to be a good one. Over 4 years, no issues with the motor but the generator seems to be pretty buggy. We get error messages once a year probably over 4.5 years.
The builder (dumbass) talked us into it. Without researching it, I would probably go generac unless you find something that says honda on it.