I feel that my APEX is the best $$ spent on my tank. Since I have installed that, I have not had to worry at all about my tank, and know that at all times it is running properly and efficiently because the programing (tho not the easiest) has allowed me to configure my tank the way I want it to be.
I have had experience with both of the units and they both have great options over each other, but i truly feel the apex is the better unit.
HTH