Kind of like a "who makes the best truck?" question. There are a lot of good options and many people have specific brand preferences.
A couple things I would consider first. Where do you plan to dive? Where will you get your regs serviced? This might play a role, if your favorite dive shop services brand X, ..but not Brand Y..
Then, whether you care about getting a brand profile from a company that is known by all, such as ScubaPro, or Aqualung etc.
Most newer regs available will function well and get the job done for your needs..
You will probably pay a premium for brands like ScubaPro, Apex, Aqualung etc.
If you are a thrifty shopper, you might consider one of several other options out there like Dive Rite, HOG, Hollis, or Deep6. Dive Rite (for example) is based in Florida, and has great reputation in this area. Just my opinion, but I think these are all top shelf options that will serve you well. They are just newer players to the market and might not have the same brand rep as someone like Aqualung, that has been making regs since the stone age. The only reason I might steer you away from these is if you have a favorite shop that will not service them.
Myself... I have several sets of Poseidon and HOG regs. But think any of the above brands will serve you well.
As far as type... I think that a balanced diaphragm that is environmentally sealed is the best for most people. Make sure you get a 2nd stage that is also balanced and adjustable. And.. has a matching safe 2nd (aka octopus) that will match the performance of your primary. (I really don't like the 'Air2' configuration).