I have been listening to two of them on youtube and I am having a hard time deciding. They both sound different in every video and I don't anyone who has them.

Is one much louder than the other? One deeper sounding?

I am also getting an Injen CAI

i personally would choose magnaflow they sound pretty good..alot of tc's have them not sure about borla

Stock exhaust sounds best. Aftermarket just sounds like rice.

From all the variations I have heard, my preference is magnaflow.

I run a Magnaflow and my friend uses the TRD/Borla. The Borla is much louder and sounds more... well ricey. The Magnaflow gives you a true cat-back and has a much deeper, more refined tone IMO. My car is turbo and my other friend is also (not the Borla/TRD guy) and he also has a magnaflow muffler from a corvette kit that he had laying around. Custom 2.5" piping and his sounds just like mine. Sooo quiet until you lay into it, then it just sounds like a CAI. Turbo's tend to make the exhaust sound a bit quieter though compared to NA with CAI, Header, and cat-back.

Stock exhaust sounds best. Aftermarket just sounds like rice.

Are you serious? What aftermarket exhausts have you heard to prove this?

and OP, go with the Magnaflow. You won't regret going catback.