memcached vs Redis

Always confused between which to use?

Here are comparisons between memcached and redis.

1. Redis has multiple datatypes list, set etc unlike memcached
2. Memcached has flat structure, multiple nodes but redis has master slave structure.
3. Redis is persistent to disk , so no loss of data
4. Redis also provides queue, caching and few more
5. Built in clustering provided in memcached
6. Memcached has default LAZY LRU eviction policy, redis has 6 different to offer also lazy and eager.
7. Memcached is multithreaded, redis is single threaded
8. Size of key in memcached can be 1 mb, redis is 512 mb key+value