I am in the Engeneering industry and i would say it comes down to the desighn and the finish of the tank and obviously materials used as you get diffrent grades of steel.
The machines you use make no diffrence you will get a better finish and more precision on a cnc vs convesional especialy on a larger batch.
The machines you use make no diffrence you will get a better finish and more precision on a cnc vs convesional especialy on a larger batch.