I have run both of these adventures for friends and played in one. My thoughts:
The Madhouse Meet actually changed one of my players from a DCC skeptic to a fan. This is an urban adventure (really, a house adventure) for a small party. Very tight and easy to run with little prep. The players enjoyed the game and I enjoyed running it.
The Museum at the End of Time had my players asking for more MCC. They liked the setting and the weird twists. I also played in this game (prior to running it myself) and enjoyed it thoroughly. The judge amped up (or so I thought) the gonzo nature of the adventure and it worked well.