I know its hard thing to say but i don't think it would be smart to get two games that are almost the same. So if there is one you would pick, which would it be?

2, just because there's more content and the gameplay has been refined from the original.

I say both because there on sale :3

My end vote will be for 2 though as its just a upgraded game of the first all for the good

RCT2 has more content in terms of things to build, and it has a sandbox mode. RCT has better scenarios. I don't prefer one over the other, but then I don't have to because I have both.

There was a discussion a while back in the RCT forum about this, might be useful to have a look through: http://www.gog.com/en/forum/rollercoaster_tycoon_deluxe/rct1_or_rct2/page1

Definitely RC2. They're both the same game, with the same engine, but RC2 has much more content, like rides, stalls, etc.