First of all, you should match the specifications of both, one the machine which you are going to purchase and second your job, you want to do on the machine.
How to Select Lathe Machine
Centre height of your machine must be match with O.D. of your job. Swing over bed and swing over cross slide should be select as per your job.
Spindle bore should be with such dimensions that your job O.D. maybe pass through it easily if it is necessary.
More Width of the bed gives more rigidity and sturdiness to the machine. In heavy work it is necessary.
In belt-driven, there are two options, flat belt, and V-belt driven. A flat belt is slipped when there is over capacity work taken on the machine and V-belt is a sturdy design to remove somewhat slipping actions. And in Gears drive (Geared Head Lathe Machine). It gives more power to turn as well as it is suited for more speed and feed and resultant it increases productivity and low electricity consumption.