My preferences for .40 size glo trainers (in order of preference), as based on direct experience as an instructor:

For learning to fly from scratch --- Hobbico Nexstar, Hobbico Superstar/Sig LT-40 (equal), Tower Hobies 40/GP PT-40 (equal), Hobbico Avistar, Tiger Trainer 40, CG Eagle2, Aircore 40

For those who have some experience (or are "naturals") --- Hobbico Avistar, H9 Arrow

Things to avoid for absolute beginners -- low-wing types, SPADs & other stik-types.

Things to avoid for all beginners --- warbirds of any description, pattern type sport fliers, biplanes.