What type of diving are you planning to do with your regulators?
When I choose a regulator (or any dive gear) I first look at the type of diving that I will most likely be doing, and then I select the gear that is best suited for that type of diving.
For instance: Are you planning to do a lot of deep diving? There are regs that are not so great deeper than 60fsw... and then there are other regs that are particularly well suited for deeper diving.
Are you planning on doing any cold water diving? Many regulators are not well suited for diving in water that is colder than 40deg F due to freezing issues. Some regulators are "environmentalized" or sealed so that they can meet the challanges of cold water diving.
Are you planning on doing wreck pen. or cave diving? or possibally using your regs on high pressure steel tanks? If so then you might want to have your regulator first stage set up with DIN fittings instead of the typical yoke fittings.
If you are not sure of the type of diving you want to use your regulator for, then I recomment you purchase one that will handle the most extreme diving situation that you think you might encounter. Better to be over prepared than underprepared...
I use APEX or Poseidon on all of my dives. Although I’m liking my APEX more these days (they are easier to get parts for).
That’s just my two cents worth....
Ron sends