I liked Turn A and the Ball with legs (forgot it´s real name) was awesome but I don´t agree that it´s better than SEED. Than Destiny YES but SEED, no.
For me, the main reason is that I don´t like the characters as much in Turn A Gundam than in SEED. Except for Lily Borjarno.
The battles in Turn A is a letdown too I think, they´re not bad but they´re not that great and exciting either.
(To be honest, can´t say that I like what they´ve done with the old cast from SEED either now that I´ve rewatched Destiny.)
But I did like Turn A. It´s not bad at all. Just not one of my absolute favourites.