I want to start running Trip World but I don't know which emulator I should be using for runs. Is there a specific one that's the only one allowed, or is there a couple to choose from?

I start my timer when I click OK after choosing the difficulty for a new file, and I end my timer when I get the "Mission Complete" message for the last mission. But I know PandaParty started once the opening cutscene first starts, and ends when the "Defeated Vectron" message appears. I'd like to get a clear rule for when timing should start and stop so it's easier to figure out what people's times are without any second guessing.