It depends on how long your going to keep them. If you have a strong plan that will let you to breed for a few more years, go for either. I like the ARS tubs more because they are not clear. Sometimes it helps to have light blocking tubs for nursing mothers.
I would just build the rack yourself. The money that goes into a home built rack is so much less.
Cool racks, both of them but you can build 10 racks for the price of one that will do the same thing IMO. I know a guy with a Freedom Breeder that loves it.