FOSS Linux published a comparison between Elementary OS and Ubuntu Linux.

Elementary OS vs. Ubuntu: Which one is for you?

Also, we are pitting elementary OS 5.1.7 against Ubuntu 20.04 LTS for this comparison overview. However, most of the points still stand valid even if you are using a slightly older or newer build of the distros.

Elementary OS vs. Ubuntu: Which one is for you? | FOSS Linux