Splinter Cell is purely stealth based, with Metal Gear you have the choice with regards to what action to take.
I don’t play Metal Gear Solid, I’ve played and completed the first, which I think is pretty much what most people have done. I much prefer Splinter Cell because I think it relies on tactics and stealth more; you can’t just run in with a shotgun and kill everyone, etc.
The new Splinter Cell, again, looks really good. Graphically as per usual, it looks stunning, and I’m looking forward to that level set entirely outside in daytime, since it’s never been done. It’ll be interesting to see what stealth aspects are imlemented under such conditions.
Not sure about the film, I’ve only seen a teaser trailer.