Depends on what is easier. If you have a computer out of the way on the floor -- for example -- it might be more convenient to attach keyboard, externals drives etc to the ACD.Not sure I understand. I connect the keyboard to the ACD then have to connect the ACD to the MBP via another USB cable? Easier just to connect to keyboard to the MBP direct, yes?
Doh! I think I am being thick here... I have no knowledge of separate screens with ports ;(
I have a MBP in clamshell mode attached to a 23" ACD. I have my keyboard and 2 external drives attached to the ACD. Works out much better in terms of cable management, etc.
The ports are on the back of the ACD. You can certainly choose to ignore them.