I have a set of each. Prolite has the standard sizes with thin maple shells and re-rings. Loads of tone and plenty of sustain. Saturn V exotic are 1" less depth on rack toms and 2" less on floor toms. Medium maple/walnut shells no re-rings. Substantial tone, a little less sustain but a lower fundamental what with the inner walnut plies. Both have 22" kicks. Prolite 17.5 depth and Saturn 18". Both kits are different enough to be entertaining. I agree with MusiQmaN in that I agree that wood and shell layup have as much of a role as depth does. It's good to try drums out in person if you can. Those Velvetone kits are really nice. I hope you kept it.