I've argued in the past that Remark is not as good as RevealJS, because it relies on client-side rendering of the markdown payload to render the slides. This makes pages published using Remark much less visible to search engines (which I can live with), and unusable unless the client has JavaScript support (harder for me to live with, given my love of EWW).
What I've neglected to mention in previous discussions is that by putting rendering into the client, tools like Remark supply the end-user with the 'source code' for the presentation as a side-effect of allowing them to view the presentation, which makes the presentation a self-contained artifact. I think this approach has more merit than I originally gave it credit for, so I plan to give Remark a try in some upcoming decks and see how I think it compares.