Of course the Kigali genocide museum doesn't really stand up to the Phnom Penh genocide museum. The Cambodians cunningly built their museum on the site of a massive execution centre, so are able gleefully to point out the bones which still work their way to the surface each day, as well as delights such as the tree against which babies' heads were smashed in order to save bullets.
I'm quite the connoisseur of the genocide museum, me.