Go with Glowplugs advice, use what is most used at your club. All major brands are good and will give you good service. I use Futaba and Hiteck mostly but have also used the others and find that all have been very good. some feel better in my hands than the others do but that is a personal preference. As a frequent instructor, I use all brands and the only brand that ever gave us trouble was the trainer switch on some Airtronics units, out of over a dozen of them, six had the trainer switches fail in use.