Well I've had nothing but grief with literally every piece of Manfrotto support gear I've ever purchased - tripods, monopods, grip gear. It's all failed me. By comparison, my Miller tripod just works, every time, everywhere and without fuss.
I'd put the money on the Miller option 10 times out of 10.
Id save your pennies and get the miller, simply excellent. Manfortto on the other hand is just arse! I have never had a Manfrotto tripod I liked working with.
Also the Miller support is amazing, those guys will bend over backwards to help you out.