Gameplay-wise
#1: Aigis
#2: Kami
#3: Others
for sure. I like sprites in kami more then others, saying this as a fkg veteran but im sure %90 of fkg players wont agree with me but thats my opinion anyway.
Not sure about senpro but i played iwz at its first month, Kami also has better raid battles than its dreamfest crap too.