I must admit I really do like Strike Freedom basically because they took Freedom which is already a amazing looking suit and found ways to improve upon that suit.
Infinite Justice is still to early to really tell I was not a huge fan of justice or any of the suits with the GIANT backpacks they just look silly.
Overall though I like the Goufs the best they arn't gundams but they seem to be the most orignal of the suits being used in GSD as most every other model is just a complete rehash with differn't weapons stuck on them.
I must also admit I like Gaia and Abyss quite a bit as for transforming gundams they have 2 good modes unlike say Chaos which looks absolutely terrible in its alternate and regular modes due to the giant drums glued to the back of it.
Personally as for Aegis the concept was good the mobile armor mode looked like poo.
Of the orignal 5 I have to say they all had some nice unique atributes and Yes Terra I think Yzak's Dual was very well done expecially with the reasonable upgrade of the assault shroud.
I also must say I liked Strike MUCH better then destiny considering the color change for each silloute was simply a blantant attempt to sell more models. On the plus side this was fixed with Destiny.
As for both Providence and Legend I absolutely HATE these models the backpacks with dragoons along with the round turtle shell on the back just look appauling to me atleast. I'm a much bigger fan of how Strike freedom can store its Dragoon units without affecting the mechs operation.