Any particular bad things about either of these models.

The ucantdo is ugly as hell and you could do more and better things in a much neater and floating airplane......The Funtana!

What is the better plane for 3D? In the 40 size range? .........A profile....I've never flew either of the planes you listed but have seen both them fly, both seem very capable.

The funtana will fall apart in the air in about three months of flying it...I watched as mine burnt into the ground after the wing broke away....I was not sad to see it go..But I still take the UCD out to fly now and then...and would be upset if it went in!

a profile will do better flight wise. I have flown both the ucando and several funtanas. the funtana leaves me flat, the ucando hovers about like my seniorita. my omp and mini 3d make them both look sad. my freind's (remcl1)extreme flight edge is about the closest arf to the omp (by the way, he had a funtana w/ ys63 and later magnum 91 and a ucando 60 w/ ys110; he sold them both after a few months and got the edge!). again, that's just my experience with them, what do I know? only been flying since 1976 but of the 2 you mention, the funtana looks better, and I prefer flying the ucando with a saito 72 or ys63.