Before I got my 3000is I had the opportunity to try a few different gennys. Including Honda 1K and 2K's, we use them in the marine business.
Something else to consider.
The Honda 2k would run the AC on our TT, worked hard, but ran.
The 2K's, whether single or in tandem are louder for a given load then the 3K
2K's have a less then 1 gallon tank, 3K has a 3.4 gallon.
2K is 46 pounds
3K is 130 pounds
Convenience wise, the two 2K's would be easier to move around, overall weight though will be about the same once you add the parallel kit. That may be a concern to some.
The fuel issue can be made much easier with something like this kit, which will work with several different brands of the suitcase genny's
http://www.wisesales.com/bergs-dual-feed-extended-run-tank-for-honda.html
I didn't take notes, but IIRC the 3K in eco mode used less fuel then the two 2K's in eco.
Whatever genny you get, fuel supply becomes an issue if you don't want to be running out every day to get fuel.
Although the Cyclone has a 25 gallon on board tank I also use this portable tank to get fuel once we are setup.
http://www.tractorsupply.com/en/store/scepter-duramax-flo-n-go-14-gal-cap?cm_vc=-10005.
The pump leaves a little to be desired (hand pump) so I use a seperate hose and just gravity feed into the cyclone tank, leaving the tank in the bed of the truck.
2 of the Champions and parallel kit, fuel tank is about $1500
2 Honda's and the parallel kit are about $2400
1 Honda 3K is about $2000
My disclaimer is that I got my Honda 3K for reasons other then camping and there were no other similar option available at the time (parallel kits or other brands)