Both RCT and TP (you mean that Theme Park with a black ant teaching us how to play the game and saying "ahem" whenever we ignore him? woohoo) were coincidentally released in the same year, and they were insane, Theme Park having a little advantage for having 3D graphics... not THAT great but whatever, it's 3D! I have spent days to unlock that last scenario, the Spacial one but after achieving that I simply got tired and uninstalled the game forever!
Theme Park Inc is almost a copy of the previous one but at least it has that cute female ant, huh