Well, BO wise Potter is ahead ($7.7B with 8 movies vs $6.3B with 9), though with Disney soon having 3 MCU movies a year that'll probably change (even with Fantastic Beast trilogy coming).
If we're talking world building, Star Trek and Stargate are well ahead of MCU. Their universes are incredible. I've only completely watched Stargate and with several movies and 17 seasons (plus an animated series), all connected, it's much more complex than the Marvel universe, even with it's Tv series.