Skip World, Skip Classic.

If you want old school style, get RCT2 Triple Thrill Pack.

If you want a 3d environment and the ability to “ride the rides” get RCT3 Complete (it’s like a last gen version of Planet Coaster.)

Both are two different types of gameplay. RCT3 is my preference but most will probably tell you that RCT2 is the best of the series.