Half Blood Blues and Year of the Flood (the only two I have read) I would say that both are good choices. However, I would choose Year of the Flood. I don't like every Atwood book but the first two books in this trilogy are excellent and should be on people's must-read list.
I'm planning on reading The Year of the Flood before the Canada Reads week. Then some time later this year I will read MaddAddam. I mostly do like Atwood's writing and especially her speculative fiction books.