What's the difference between a factory-created CacheClient interface and a direct injection one?

[MapleWithoutWords]

first question: What's the difference between a factory-created CacheClient interface and a direct injection one?
second question: What mode should I use?direct injection xxxCacheClient or used factory-created?

[doddgu]

Multilevel has memory cache for one level cache, and auto sync memory and distirbuted cache (like redis). But I think we need clearer descripton for them.