The Handmaid's Tale was the first novel I read of hers, and I absolutely devoured it.

Needless to say, I think The Year of the Flood might be better, or at least comparatively good, since they're both dystopian, but in very different ways, and they're written a bit differently. The Blind Assassin is way too different to compare, and it's really more of a quiet drama, but I love that as well.