When comparing Prezi vs reveal.js, the Slant community recommends reveal.js for most people. In the question“What are the best presentation programs?” reveal.js is ranked 2nd while Prezi is ranked 6th. The most important reason people chose reveal.js is:
Completely free and open source and also very customizable.
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Pros
Pro Easy to collaborate with co-workers/friends
Another benefit of it being a web-app is how simple it is to collaborate on presentations.
Pro Accessible online with storage
Accessible online so all your work stays online (in case your computer breaks) while it has a cool and easy to use templates and designs.
Pro Lets you create beautiful presentations that flow well
Prezi helps you create presentations that tell a story. The UI lets you create a storyboard for the presentation so it's really easy to design the big picture for the presentation and then drill down to the individual "slides".
Pro The Storyboard UI makes it easier to think through presentations
Instead of being constrained by individual slides, Prezi lets you input all the various text & media you want to cover and then organise it into a logical flow later on.
Pro Cross-platform with sync
There is a fully featured web-app as well as apps for Windows, Mac & iOS (iPhone & iPad). All the files sync across the platforms platforms so you don't need to worry about managing files etc.
Pro FOSS
Completely free and open source and also very customizable.
Pro Compose your slides in plain text
Pro Can be embedded inside webpages
Pro Multiplexing
Master presentation controls clients. Using this is in remote situations with multiple clients is really powerful.
Pro Speaker notes
Pro PDF Export
Pro Lazy loading
Distance of slides that are preloaded can be configured, thus avoiding bandwidth bottlenecks.
Pro A smartphone can be used as a remote control
Cons
Con Might run slow
On lower end systems it might be a little too slow, so you have to take into account what systems are you planning to present on.
Con Online only
This presentation application is only available through a browser, with the data hosted on Prezi servers, with all the obvious privacy concerns it induces.
Con Freemium
Limited to create a different presentation and privacy control, revocable share link, etc only for premium user.
Con The transitions are a distraction from your content.
Prezi encourages you to use gimmicky, distracting transitions.