I personally prefer the maintenance of eggshell and am ok with the shinier finish with lighter colors, but prefer the flat, less shiny finish with darker colors. I would suggest eggshell based on your mention of maintenance and adjacent semi-gloss.

Flat is the best finish at hiding imperfections. However, if you want something that's a little more cleanable, go with eggshell. It just has a little bit of sheen, and is also good at hiding imperfections. My whole house is painted in this finish.

Hi---

Flat is best to conceal imperfections. Eggshell is easier to clean and more practical if you have children. Good Luck!