RE: aircore trainer or a alpha?
Given a choice, I'd suggest the Alpha, at $280.00. No real decision here.
But, there are several others to consider. The Hangar 9 Xtra Easy II has a larger wing (the better to see you with) and a real JR 5 channel radio, It's $380.00.
Also, they have the Arrow, basically an Alpha with a semi-symmetrical wing, for a little sportier aerobatics. Also about $280.00
All 3 Hangar 9 planes are very complete and can actually be used as "trainers". They all have the correct flying abilities that a good trainer should have.