It depends on how you grow them. If you remove the suckers then you can have plants closer together without overcrowding, and that can also make sense from a disease management perspective (less foliage on each plant). But suckers on tomato plants don't actually suck any energy from the plant and they become fruit-bearing growth stems themselves. So all things being equal, a plant that hasn't been pruned will produce more lbs of fruit than one with the suckers removed, by a considerable amount.