both are kinda bad.
the rear mez will feel like you are in the back of a bus looking through the windshield
the balcony is tight when it comes to leg room, good in that there is nothing above you to box you in, but you are up high and it feels like you are looking down at the stage (and tight leg room in the front row)
http://www.flickr.com/photos/27199361@N08/ Phantom at the Royal Empire Theatre