I would say glow as well simply because you'll find more people who know how it works. Electrics are good if you spend the money getting good equipment (motors, batteries, chargers) but unless you find a club with a lot of people using electrics successfully, then you'll be on your own trying to figure out what works.

Bigger is better. I recommend a .40 - .60 size trainer. I also recommend you build your trainer instead of getting an ARF.