Need opinions on 32 bit controllers.

I am considering upgrading to a 32bit board,, most likely a smoothieboard clone. My question is are they really worth it? The reason i aks because it seems alot of them only offer the following for motors, X Y Z and E1 and E0, but not for a second Z motor which i have on my printer. How would i connect the second one> wire both motors together and adjust the voltage/amperage in the firmware? Or should i just stick with 8bit and wait for better 32bit board development? because any board i look at only has no dual Z.

thanks