anyways, Tails is the hero and Sonic is his number two. they still generally retain their core personality, but just tweeked to suit their role.
I feel like Tails would probably be more prone to plans and problem solving to defeat enemies. And Sonic, although skilled with the things tails used to be, is much less skilled in the whole "techno-babble" thing. He can't explain how it works, he just knows it does. He's also just not as generally smart as tails.