I've used Beamer to prepare all my slide-based math presentations, and so does virtually everyone else. It works pretty well with minimal effort. It even has sensible defaults to dissuade users from creating walls of text, although I've definitely seen my share of walls of text.
In my trial I created a few presentations with Reveal to see whether it could replace Beamer. Some of you are probably asking why I would even want to do that, given that Beamer works so well. Actually, I was just curious. However, I also found that Beamer is difficult to tweak when the need arises. Modifying themes and customizing the layout of slides is not easy. That's not Beamer's fault. Pretty much all of LaTeX follows a simple pattern: if something doesn't work, look on StackExchange. Seriously: TeX is a baroque language. On the other hand, I somehow doubt anything could ever replace it. The annoyances that do occur are minor, it is practically bug-free, and it is so stable that I'm sure the source files I've already created will still compile into identical PDFs long after the heat death of the universe.
So, what's my conclusion with Reveal? To start, it is much easier to change the look and feel of Reveal assuming you are comfortable with CSS and HTML. The presentations with Reveal also look a lot nicer, especially compared to some of Beamer's themes. There are more slide options and more ways to present material. For example, slides move horizontally but there are subslides that go vertical. These subslide can contain additional information that could be presented in case an audience is especially interested in something, but could also be skipped without breaking the general presentation flow.
Would I recommend Reveal for math? Despite its style advantages, I'd say no. For one, if you actually want to use math in your presentation, you have to download MathJax yourself and link it to Reveal. You could use a CDN, but then you'd need the internet.
Also, Reveal is rendered on the fly using a folder of files. Therefore, you need to use your own computer as opposed to a conference computer, or put it on a website. You can render a Reveal presentation to a PDF, but it looses all the interactive features, including incremental revealing of slide contents. Beamer on the other hand renders PDF slides with transitions.
So, while Reveal is a cool piece of software, it really can't compare to the basic usability and reliability of LaTeX, and you should really only use it for complex math presentations if you don't mind doing a lot of extra work. And if you need to draw nice commutative diagrams, forget Reveal.