I am actually shocked out how I forgot about Sim City. God damn, those games from the 90's were so awesome....
But yea, RCT2 was my favorite for the more smooth feel it had. RCT1 was fun for the huge number of scenarios that were actually very interesting, and challenging. But, sadly, the game has aged so much that I cannot sit there and enjoy the game with the graphics as they are... maybe if I sat down and forced myself...