I read a lot about these two controllers and seend them perform. The Apex does a great job but if your looking for the best out there the Proflux is hands down. Way to many options that no other controller can match
I have no experience with the Profilux so I cannot comment on its options but I personally run the Alex Lite and it is stable and does everything I need it to do. I love the ability of controlling your reef tank through your iPhone and each firmware update they do gets better and better.
But I'm interested in checking out the Vertex Cerebra when it becomes available.