Board Thread:Questions and Answers/@comment-26544002-20151221115738/@comment-3104099-20180203150054

Here's what I think :

Kogetsu - easier to train with, higher durability and offence. Range and versatility gets increased with Senku.

Scorpion - requires speed and agility to master. Lower range but much higher versatility further enhanced by its shape shifting ability and combination with Grasshopper.