one motor or two to raise/lower a platform ?

On my new bot I plan to have a horizontal aluminum bar that raises and
lowers, perhaps by lead screw(s) or twin lines over pullies. Other items of
significant weight may at times be attached to the bar. The bar would be
stabilized by riding between two upright tubes or rails, with appropriate
bearings/guides.

Assuming motor weight is of no concern, what is best solution if there are 2
screws or 2 lines: one motor to work the screws or lines; or two ? I assume
the hardest part with 2 motors is to get them to sync up and turn at the
same speed simulatenously;

Would a single motor capable of handling the load use more power/current
than two motors doing the same work ?

Thanks !