Given the rate at which we are progressing on SSD endurance, these methods will become irrelevant. Even 5 years back, the old tech report article showed that for an average user, they could handle a lot of writes.
I have been using duckduckgo on all browsers, including mobiles, for 2-3 years now. There are occasions when I don't get good results. But when I try the same query on G, the results are equally useless. So, I have since stopped using anything else.
Although, I should say, bing was equally good when I used it before duckduckgo, until they added that horrendous news feed in the bottom.
This is great! In my case, only reason for choosing Redis over Memcached was persisting to disk. With memcached being multi-threaded compared to Redis being single-threaded, I see a big win in simple use-cases for Memcached.