Kermit!
And Byron, what has Mickey done for me lately?
Like...in the last 40 years...
Actually, Mickey visited my workplace the other day. It was kinda unnerving, because IN THE SUIT, he was about five feet tall.
It freaked me out. Especially because I was busily working at my workstation, totally absorbed in something or another, and then someone tapped me on the shoulder and it was MICKEY!!!! I very nearly dropped the F-Bomb on him, but I don't talk that way anymore. Much.
So anyway, I say Kermit, for a lot of the same reasons that Cory already outlined. He's more than a mascot, has more personality, and is really the center of everything the Muppets have ever done.
Quinnnnnnnnnnnn