"one day in the life" is the superior book IMHO. I would read that one first.
"Gulag Archipelago" is non-fiction and a lot drier. Its a tough slog. As I recall, volume 1 is the most interesting.
Another novel of his which I read is "The first circle". Also very good, as I recall.
Another similar Russian novel which I would highly recommend is "Life and Fate" by Vasily Grossman, which is set in WW2.
__________________
|