Chrisp32,
That's an easy one. Spend the extra and get the LT-40 that has never been flown. On the other plane you have too many unknowns. You don't know what plane, what engine, how many flights, or if it has been damaged. The extra money for the LT-40 is worth knowing that you have a plane that never been flown or crashed. And besides, you will be hard pressed to find a better flying trainer than the LT-40. It really is one of the best flying trainers available.

Ken