Board Thread:Questions and Answers/@comment-33827597-20171201083319/@comment-1327106-20171201092745

Reading the manga is best if you're sensitive to spoilers. If you hang around fans it's hard not to accidentally bump into something even if you're trying to be careful. Otherwise, pick the medium you like best. If you don't normally read manga, sticking with the anime is fine. The anime is very close to the manga so you don't need to worry about it running off in some random direction or padding with anime original episodes.

The early volume of manga are also really rough because Isayama wasn't that good an artist yet. He's pretty good in the current volumes, but it can be a little painful reading the older ones.

If you want to pick up the manga after the anime left off, start with Volume 13. It picks up right at the end of Season 2. You'll recognize one of the scenes from the final episode, but the rest will be new.