Does anyone remember the recent spin training thread? Any modern training aircraft should be spin resistant - it should not spin unless grossly mishandled. The recovery should be straight forward as long at the aeroplane is correctly loaded (and rigged) and the correct recovery applied. XP-72, disturbed to hear about improperly conducted flight testing for the PA-38, doesn't the FAA have something to say about this?
I haven't flown Chipmunk, Robin, Jet Provost, Slingsby, Zlin etc... However, none of those are exactly widely available training aircraft.
I'm a Traumahawk fan. Plenty of room in the cabin, nice low nose attitude in flight (important for teaching attitude control - difficult to teach attituide selection and control if you can't see the horizon) and simple to land. I think it flies OK, certainly no worse than PA-28 or, worst of all TB-10. And you don't have to spin them here in Oz. And they don't seem to lose too much performance in the heat (obviously I can't justify that, just an observation).
So Vote 1 for Tomohawk.