well before you go off and buy a controller just for these things, think about what kinda system you plan to run in say a year down the road, then figure out the equipment that you are gonna wanna run with it and buy a controller that can be expanded later down to line to handle ORP, PH etc etc controll.
but of the two that you ahve listed i would go with the AC JR. or step up and find a AC II .
Tim