I love Keynote, but after spending a lot of time in LaTeX Beamer when almost anything can be changed temporally within a slide using overlays, Keynote has frustrating limits. For example, you can't animate changing the background color of a table cell.

Also, its tools for editing embedded videos are quite less capable than PowerPoint's.

Not sure if PowerPoint can do the table cell thing. But overall, I still feel the perfect slide making software doesn't exist yet.