Another big difference between a <insert name here>-stik plane is the wing. A trainer wing has a lot of of dihedral built into it. This helps make the plane more stable. The dihedral will try to return the plane back to level flight if no inputs are used. A stik plane has a flat wing. With a flat wing the wing will stay exactly where you put it. If you use the ailerons and bank the plane, when you release the ailerons the wing will stay exactly where it was until you use OPPOSITE ailerons to level the plane.

A trainer also has a flat bottom wing, while most stiks have a semi-symmetrical or fully symmetrical wings. This makes them more aerobatic. This is not a bad thing because this is what a stik is made to do. But that also makes it harder to learn on.

While it's possible to train somebody to fly with a Stik, it will be harder than if using a trainer. It is usually more frustrating for the student, and definitely more work for the instructor. If asked I wouldn't recommend training on a Stik, but rather spend the time with a trainer. Time on the trainer is definitely well spent if the time spent is done correctly.

Hope this helps.