I managed to finally get them all the other day! (omg 15 hours camping for Skoll!)
My opinion in this order:
1) Skoll -
Definitely the best looking. Once you see him up close, and in bestial wrath (he's frigging huge!), theres no doubt he definitely looks the best! I may be biased in the fact that this one took me the longest to get though!
2) Gondria
I don't know why no one ever gives Gondria credit! Screenshots and standing still in Dalaran don't do Gondria enough justice! Once you get Gon out in the wild running around chasing creatures, he/she looks totally amazing! One of my hunter friends has Gondria too (mines Casper a boy, hers is Purrfect a girl hehe). We go and do battlegrounds with them out together, and it looks awesome, two nearly invisible cats darting around the battlefield munching on people! The enemy looks so confused!!
3) Arcturis
A laser bear! He looks awesome! He sometimes seems to go almost invisible especially when under bestial wrath! I like him but not as much as Skoll or Gon

I gave him charge, and use him to charge people in duels hehe. Its funny because he stops in front of them to spirit strike then unleashes a charge!
4) Loque
Loque is great having his own model! But probably because I have had this one the longest I am so used it, and so like it the least. Loque does look amazing under BW though!
All in all I'd say I love them all. Skoll however gets my vote
