The LT 40 is a fine airplane to learn on. Stick with trainer planes and an instructor, then move on to more difficult planes. You will save a lot of money if you have an instructor with you.
The Super Frontier Senior is a large plane, easy to see and control. It looks like the Sig Senior Kadet, which is the best trainer, but they don't have them in stock anymore. The larger the wingspan on a trainer, the easier it is to see and fly.I am not familiar with the SuperFrontier, but it looks fine for a trainer.