The best claw crush depends of your play style:
Aka : Great NM (normal strike) , good SM (Super move).
He is a beast agaist light armorer warriors. He can destroy most of the glass camnons (low health with light armor) with just one SM. He is the balanced attacker.
Doongara : Good NM , Great SM.
He likes destroying air ! If you need to fight vs an air heavy armorer enemy , he is your man. He is the elemental attacker.
Seni : Decent NM , Amazing SM.
Do you want to destroy an enemy ? Do you want to K.O that stupid warrior ? He likes to destroy warriors ! But he is fragile , so beware to fire enemies , they can easily kill him.. The physical attacker.
Paccorus : decent NM , bad SM
You want a wall to withstand the damage ?
You want a high durability warrior ? Paccorus is good for his job.He is the tankiest.
I prefer aka , but most of this forum prefers doongara. Make your choice