Hello! I am not an expert on literature not written in English, though love reading Tolstoy in translation. I have read Garnett, but it’s quite old now. People say good things about Briggs. I have a friend who knows a lot about Russian lit, and I will get back to you with his opinion. In the meantime, I found this great discussion of War and Peace translations on this site: https://www.tolstoytherapy.com/best-translation-war-and-peace/
I think you’ll find some good discussion on your topic there.