I went with Diesel for a few reasons:

1) It hardly ever goes bad if treated properly
2) Hard to ignite outside of the engine. Heck it's hard to ignite inside the engine too!
3) Most consumer gas generators are junk. They aren't designed to last very long. I plan on staying here for a long time and don't want to have to replace the whole unit (ever).
4) Most diesel units are 1800rpm instead of 3600rpm. This means they are quieter (ok, it's all relative) and will last longer than the faster turning engines.
5) By design diesels have to be tougher. This translates to durability.
6) I had a diesel car as well. That is gone now but it's still just as easy for me to transport diesel and I don't have to smell gasoline in the car when I do.
7) Diesel generators run a LONGER time on the same volume of fuel than a gasoline generator will. You'll notice this is especially true when the generator is running at low load. The minimum fuel used by a diesel is far lower than that of a gas engine.

-Tad

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1995 G320
2003 C230 Kompressor Coupe
2005 ML500
2007 ML350