I am generally skeptical about these Amazon specials on Solar power, but the two you cited appear pretty reasonable, to me. The price difference is getting a MPPT vs PWM controller. If your budget is real tight, I don't see why the PWM controller would not be adequate for you. Both controllers have enough capacity to add another 100W panel if you decide 200W isn't enough. the fact that your space has plenty of sunshine is encouraging.... 200W should be plenty sufficient to keep your fridge going during the day if you don't run any other significant power users.