MCU has a much higher consistent rate of quality to the X-films, and that becomes all the more so if you look only at the main X-films, as Logan and Deadpool which are the two best atm have both been spinoffs, whereas the main films have always been rocky and have gotten even more so recently.
It’s one of the reasons why I’m very curious to see how the MCU handles the X-Men, because I want to see what happens when creatives who understand and love ensemble superhero stuff get to start from scratch.