In RCT3 definitely sandbox (or the scenario editor in case of RCT3 ) and i go for that choice again.
I expect that Planet Coaster will have many great new systems in place to bring scenario's to a whole new level of awesomeness. I think my choice could change easily. The RCT3 scenario's weren't so special for me, because i missed the challenge mostly. I remember that it was sometimes more difficult, because of a difficult landscape. I never played them more than once. I know it isn't easy to balance out money, guests reactions and all that in a game that gives you complete freedom.
I expect that Planet Coaster will have many great new systems in place to bring scenario's to a whole new level of awesomeness. I think my choice could change easily. The RCT3 scenario's weren't so special for me, because i missed the challenge mostly. I remember that it was sometimes more difficult, because of a difficult landscape. I never played them more than once. I know it isn't easy to balance out money, guests reactions and all that in a game that gives you complete freedom.