I use Redis because of some of the extra features for sets and queues and such.
If I just wanted pure kv store i'd still go memcache. local install for stuff that can expire often (html template caches) and reach out to a network store for user sessions and the like.
all my kv caches are designed to be rebuilt and not care. if you need ACID kv go with a proper db.
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Have YOU tried benchmarking any of them locally or in the cloud?
updated the post
I use Redis because of some of the extra features for sets and queues and such.
If I just wanted pure kv store i'd still go memcache. local install for stuff that can expire often (html template caches) and reach out to a network store for user sessions and the like.
all my kv caches are designed to be rebuilt and not care. if you need ACID kv go with a proper db.