The nice thing about getting the Honda 2000s is that you can, with a bit of effort pick them up and move them around, thereby carrying them in the pickup bed is a good option when traveling. I would think the Onan Microlite is much heavier and harder to pick up and move, at least by one person. Same with the Honda 3000, which he didn't ask about. The little 2000s weigh about 50 pounds while the 3000 weighs over 125 pounds if I remember correctly. The 2000s paralleled will run your 15,000 AC but you might have to be careful adding any more draw while you are running the AC.