That is a tough one. For voice, both classes are not young. David Hayter, for the Jedi Knight, has more of a heroic voice, and Nolan North, for the consular, is more wise. As far as playstyle, agility based tends to flow towards Ataru for me, meaning sentinel, combat spec.
That is my take on it. Good luck with either choice though!
Edit: Adding to it, you might keep in mind that the dual saber style of the shadow has elements of Juyo and Ataru in it. It comes down to whether you want to dual wield or use a double bladed saber. My first feeling though is sentinel, as you stressed agility, and Ataru for sure is that embodiment.
Wait....Solid Snake is the male jedi?