The battle of the crustaceans.
Its Kingler vs. Crawdaunt.
Kingler is a fan favourite. And honestly, I can see why. It looks cool has a great attack stat. In the anime, Ash's kingler got 3 DEM wins in the Indigo League but has rarely been seen since then.
When Crawdaunt was first revealed, many fans dismissed it as a cheap Kingler ripoff. When its competitive skills were scene, again it was dismissed as a weak and slower Kingler. Now it has Dark and Water type Stab and is a great Pokemon. Crawdaunt has appeared a few times in the anime mostly as the antagonist's Pokemon due to its Dark Type.
Which do you like more?
Which would win in a battle?
Which is more useful?
I always loved Crawdaunt. How I wished Ash would evolve his Corphish but he didn't. I think Crawdaunt would win in a battle due to its dark type moves.
Both have got limited uses. Both are outclassed. So finding out who is more useful is hard. So its a tie here.
My vote goes to Crawdaunt.