RE: Aircraft progression
trainers are trainers. The only difference is size and in your mind. If you can fly one resonably well then the other should follow. You will not learn any new skill sets with one over the other, small changes between trainers are how well they fly and glide rates and semetrical wings resist cross winds better. for new skill sets learn to fly a low wing aircraft with semitrical wings, little or no dehidral. The tiger and 4 star are great choices.