Please compare GRAW and GRAW2

I am trying to decide between these two games. I've reseached both but I'd like opinions from people who have played both and clarification on these two points.

Thanks.

Specifically:

Does GRAW allow you to interact with vehicles at all?

Does GRAW2 have a offline multiplayer component?

Honestly, they're both about 20 dollars new now, so I'd just get both. They're great games. I'd say GRAW2 is pretty much just an upgraded version of GRAW with a couple more features. And, yes, in GRAW I believe you have a helicopter shooting sequence. I don't know much about the offline multiplayer in GRAW2 as I never used it.Canvas_Of_Flesh