Ok, I know that they are completely different movies... one is a straight forward thriller, the other is an exercise in pure terror!
But in my opinion it's like the makers of Inside pitched Inside as The Hand That Rocks the Cradle meets pure ultra-violence!
For example I was watching "The Hand.." yesterday and it came up to a scene where I thought the Inside guys must of created a homage scene to "The Hand.." but just upped the ante.
Anyway, which movie wins for you? I'll take Inside, but The Hand is a solid thriller.