Which Sims 4 Challenge is the best!

Ever since I heard about the Legacy Challenge in Sims 2, fairly early on in my time playing that game, in fact -- I have been exclusively a Legacy player. I don't even know what Sims 3 or 4 would play like if not doing a Legacy. I can't picture it. LOL.

I do plan on doing the Movin' On Up challenge, and I have invented a variant of Building Newcrest that I want to try. But these take months to play so who knows if I will ever get to them... I'm still on Gen 3 of my first Legacy since coming back to Sims 4 in early June. So it may be next year before I am doing Movin' Up.