I'm primarily looking for offline functionality when traveling (likely without internet connection); Map functionality would also be nice. FWIW, I also posted this question on Quora.
closed as primarily opinion-based by Dirty-flow, Vince, Mark Mayo, mindcorrosive♦ Oct 22 '13 at 23:53
Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise.If this question can be reworded to fit the rules in the help center, please edit the question.
Both are fairly usable and work offline. And they're free.
I also recommend mapswithme, for offline maps. There's a free version and a paid version which also allows you to search the maps, which is super useful (I'm not affiliated).