even after 60 hours of gameplay. Am I the only one?
Midas' is the deeper voice, while Holt is the one always cracking jokes.
Yeah, Midas has a deeper voice. Holt is much more upbeat both in his cadence and tone.
They sound totally different to me.
Another way to tell the difference, assuming that you're near them and can see their faces: If one your squadmates is moving his lips as he's talking, that's Holt. If none of your squadmates are moving their lips, then that's Midas (the one with the scarf covering his mouth).