caching hot data: redis versus memcached

Hey everyone, I'm trying to decide on a caching solution for some frequently accessed, relatively static data in our service. We're looking at Redis and Memcached as the main options. I know Redis has more features, like persistence and different data structures, but Memcached is often mentioned for its simplicity and pure speed when it comes to key-value lookups. For what we need, which is mostly just fast retrieval of simple data, which one do you guys think is better and why? Any traps to watch out for with either one?