Check Yes, they may seem to promote those brands cause they are the most popular affordable smaller standby generators for the average home owners. Not sure if you browsed the site right cause there are a lot of info on if you click on the left top quick search box under brands, sizes, fuel etc and there are hundreds of portable and standby generators. You can compare and read reviews. I think there is enough info there for the average guy who has no or some clues about generator and this site explains a lot. This was based on my decision to buy a Generac.
Thanks again, K man, I was looking over on the right-hand side of the page. I did later look at the left-hand side display, whereby you could choose specific brands, and I looked up Kohler, and the 14 RES and the 20 RES seem to have cold starting problems. Mine is the (now discontinued) 17 RES, and I am wondering if maybe these newer 14 and 20 kw generators have gone downhill since I bought my 17 kw in 2010. I have never had a problem cold starting with my 17 RES, even at 20 below or colder.
Meanwhile, it would be interesting for someone to collect a little table with the various specs from the various brands, such as noise levels, total distortion, and the like. It seems that these types of specs, especially the distortion specs, would really affect how hard the generator is on your electronic equipment. Also, I have installed a whole house surge protector, but I have heard that the problem of "brownouts" is the what you really have to watch for in terms of their effects on electronic equipment, including your furnace controller. So, it would seem to be important for the generator to start up as quickly as possible when the voltage drops down but not completely down to zero. My Kohler manual made a big deal out of the fact that the generator kicks on fairly quickly after 10 seconds, and kicks on even if the power isn't all the way down to zero. So another question is, which generators start up quickly, and which generators kick on when, for example, the voltage level drops X percentage? I have been at the cottage when the lights would dim and then brighten, then dim and brighten, to the point where I ran downstairs and turn off the power completely so that the generator would kick in, in order not to damage my equipment. This has happened more than once, and I take it as a kind of warning sign that the power is about to go out completely.