RE: <<<WHICH IS THE BEST TRAINER>>>
What is the best? Not a fair question. The best is what you can get or need.
If you have no chance of having an instructor, NO CHANCE!, then do the Nexstar, no question.
If at all possible, GET AN INSTRUCTOR!!!!!!! Do not be too proud to ask for help.
If you are on a Budget, do the Super Star Select. For the 300 it is the best value on the market.
If you can afford to take the step and this is something you want to do; 60 size trainer, I like the Hobbico 60 size trainer myself, (don't remember the name) a OS Max 61 FS motor and at least a 6 channel radio. Don't worry about computer radio or any of that stuff.
Either way, if you get hooked on this, as most of us have, you are going to buy another radio with in the next 6 months and at least one more engine.
Every trainer on the market are the same planes. High wing, flat bottom, stab on the thrust line, nothing spectacular to look at. Most current trainers with aielrons are still based off the PT 40 which is the old Bridi Trainer 40.
Advice in R/C. Get the best you can afford at this time.