When I prepared my Android Layout 101 talk, I looked for an easy way to put my slides online. I started with Landslide because it has a lot of options: table of contents, speaker notes, export to pdf etc. But then I hit a major limitation: I wanted to show xml files with certain words highlighted. Since Landslide generates syntax-highlighted html with pygments, there is no easy way to add custom style. This was a tie-breaker for this particular talk I need the answers highlighted within the xml context.
A bonus for using the Google HTML5 slide template is that it works with my wireless presenter, so I can be anywhere in the room. Very convenient.