I have both #425 and the OCW. I use Optimum No Rinse to wash my car and apply the OCW before I dry the car and love this combo. If you want something to use after washing the OCW is fantastic....very easy to use, economical and looks great. The OCW has no cleaning properties and should not be used as a QD product. The #425 is a QD that leaves a very slick surface and smell great. However, in my opinion it is on the low end of QD products for cleaning ability. Looks great and is very slick but I like other QD better (specifically QuickShine).
It really depends on what you your objective is as to which one is right for you. Do you primiarily want cleaning, looks, slickness, protection, durability or all purpose?