Interesting comparison. I think joker was a very cleverly made movie, addresses a prominent cultural issue, had the tone of a classic taxi driver type movie, and tied an iconic character into it nicely.
But purely as a movie, its not that good. Felt kind of hacky actually. Its a 6.5/10 at best and people really over rate it because of those other factors.
Civil war was a genuinely good movie. Great story line and build up, multiple strong characters with their own motivations and arcs revealed throughout the movie. A good balance of comedy and light heartedness that marvel is so good at. It was a really a great, well rounded movie experience, and i could watch it again multiple times. I'll never sit through the joker again. Solid 8.5/10