RE: Best trainer
You said KIT, so I'll assume you mean KIT....
My trainer is a PT-40 from Great Planes.
Has a few build options which make the plane more or less sporty. I chose all the "Sporty options". The construction process was fantastic. I've always been a "tinkerer", am a DIY type person. The construction was just the right level of challenge/simplicity I enjoy. Everything went together just as instructed. I was very impressed.
As for how it flies, well, I have burned holse for a season now, and the only damage done was when I looped the wrong way while flying inverted. Clopped the top of a tree, and had some minor repairs to do. It survived very well considering there was a huge thwump on impact!
It flies really well too. In comparison to the other beginners at my club, who ALL fly Avistar ARFS, it is an aerobatic masterpiece... ;-) Maybe that's just my flying ;-).
In reality, when it comes to kits, once you have built it for yourelf, it is without doubt better than any other trainer out there.
Since the PT-40 had not been mentioned, I thought I would sing it's praises for a while.
gus