I fly a lot of diesel. My advice is go glow unless you have a friend who regularly flies diesels. Very few people in the USA fly diesels or know very much about them. You will have to order fuel (which I do) or make your own, which I don't recommend (although I have done it). As far as power goes, diesels work fine in the cold and pretty well at altitude. With a glow engine you can run a higher nitromethane content fuel and get more power at altitude. It is just simply going to be much easier to get set up and to get help with a glow engine. (Wonder why I posted here rather than on the diesel forum?)