While they have similar capabilities, they are not the same. Off the top of my head, the differences/improvement of the 2016 vs the 'classic' model include:
- The Orange Apex 2016 has a newer processor with more memory. One benefit of this is that it allows over-the-air firmware updates instead of having to connect to a computer.
- Built in WiFi
- Works with the EB832 - allows individual outlet power/current monitoring and programming logic based on this
- EB832 has LED status lights for each outlet (not a huge deal but nice to have)
- EB832 also has 3-1Link ports and 2-24V controllable DC outlets. You can add these to the classic version, but they require purchasing an extra module.
- Includes a salinity probe (can be purchased separately for the classic)
- Different internal web server (I haven't seen the two side by side to compare them, so I can't say if one is better than the other)
- The classic comes with a display; it has to be purchased separately for the 2016 model
I have a 2016 model, and I will say that the extra DC ports on the EB832 are nice. I have my LED sump lights, some fans and a PMUP ATO pump hooked up to them, saving 120V outlets, meaning I only need one energy bar.
Of the currently available and announced peripherals, only the EB832 and Trident are not compatible with the Apex Classic. Other things like the COR pumps are compatible but you will need to buy a separate 1link module.