I like both for walls, it’s just your personal preference. I use eggshell/matte (different suppliers call it different things sometimes) because we have young children that go Picasso on our walls with hands and crayons, and I like satin on trim/baseboards, but many like semi-gloss as well. (Too glossy for my taste)

Satin/Eggshell for walls and Semi-gloss for trim. All are very washable and take some abuse. Semi-gloss isn't that shiny. Now, high gloss is shiny.

We just painted our bedroom using Behr Marquis in a flat/matte. I highly recommend that paint - fantastic coverage and highly rated. The accent wall was painted Sherwin Williams Anchors Aweigh (using the Behr paint) and the other walls were painted Sherwin Williams pure white (again using the Behr paint). The trim is also SW pure white but in a satin finish. Flat paint hides flaws and roller and brush marks better and you don’t get glare coming off the wall. Plus if you ever scratch it you can touch it up without having to repaint the entire wall.

Thank you. I do like Behr paint. My painter only uses Dunn Edwards or Sherwin Williams. I have decided on eggshell. Many people are telling me it's easy to clean.