TLDR: If you want to take it out of the box and have things just come together the RSR is a good choice. Decent attention to detail and a general nice appearance. Very easy to work on as long as you stay within the constraints of their system. I wouldn't be surprised if Waterbox was the same, I just don't have any experience with them. Hopefully someone else on here will.
Longer:
Lots of options. Personally I like a bit more height to my tanks, and don't like having to take extra care when running the algae scraper near the edge (it will splash over on a rimless tank if you're not careful). I also happen to like having a bit of a shelf there, and like my viewing height higher. As a result my tanks are mostly eurobraced, but that isn't as clean a look, and I'm not you.
Planet - Pretty good. The hometown choice in Dallas, TX.
AGE - Also Dallas, TX. Slightly better attention to detail, slightly more expensive. They might only do PVC bottoms now, so something to be aware of if you want a glass bottom.
Miracles (rimmed experience only, not rimless)
No first hand experience, but have heard good things:
Elos
Reef Savvy*
Some of these will have different standard tanks, IE the size I was considering at the time was 1/2" glass with some manufacturers and 3/4" with others, although most offered it as an option. Some will have low iron glass as their standard, some it will be an option. Also, how picky are you? I'm the guy who notices minor mismatches in glass panes, bubbles in the silicone, non-uniform silicon by width, fillet, end condition, etc. Some manufacturers have better polished edges than others. Some people care, most people don't. Some you can see grind marks, some the polish is a bit too matte, some they round the edges a bit much when they polish the flats. They all put chamfer on a few edges where ideally they would not be. No, none of my tanks pass these tests. My point being, if you're that sort of perfectionist then you need to both consider other options, or buy a stock tank from a store where you can personally see it rather than ordering it in.
*I tried to buy a Reef Savvy tank several years ago. They had a great reputation online. They were super fast to quote the tank, might have even been within 24 hours, but I couldn't get them to quote shipping and because the tank replacement was an insurance issue I needed that. If they'd just replied I'd have one of their tanks right now. I e-mailed, e-mailed again, called them, called them a couple more times over a few weeks. More weeks went by. I finally posted a comment about it on one of the major reef forums and magically had my reply by e-mail the next day. Might be coincidence, but I think they're simply too busy. Unfortunately right at that same time a MUCH larger used tank pretty much fell into my hands, so no new tank for me.