As has been mentioned, pretty much any trainer today is pretty good, but of the three you've mentioned I'd say go with the Hobbico Superstar. The Megatech Nitro has a LOT of bad reviews. Hard to put together, parts that don't fit, that sort of thing, and there was a recent post about the Thunder Tiger, but ONLY one.

Now, I'm only recommending a glow powered trainer IF you have an instructor! These planes are fast and relatively heavy, and if you're trying to teach yourself, one of these probably won't last more than a few seconds.

If learning on your own, go with a good electric foam plane, like the Aerobird Challenger. And get a simulator!
Dennis-