Magus is an okay commentator, he hardly provides any insight though, but is good at the play-by-pkay. Persia can and does provide insight and intricacies. Furthermore, Persia can go about 6x longer than Magus before saying something stupid and approximately 400x longer before riding Norcal dick. It's night and day. Like I said above, when Magus isn't on his bullshit, he's okay. Cons: he can't go long without getting on some bullshit.
Another thing I hate about Magus commentary is how he passes off things he doesn't understand as being bad or dumb decisions. It comes off as discrediting the player out of ignorance. That alone keeps him from being a good commentator for me. It's really the worst, and we saw it a ton at EVO last year too. Over and over again he would call something out only for the other commentator (Yipes, etc.) to correct him and provide insight/reasoning afterwards. Terrible habit.
Persia any day of the week. I don't see a single good reason why Magus is a better commentator when none of those problems are present with Persia AND she can do play-by-play.
