Great post. Redis is just kinda overkill whenever I've had to use it. Memcached by contrast is very simple, fast and works without needing to do much fiddling with it.
One big tip I should recommend is to increase the default memory size limit to something more realistic for modern hardware (and arguably this should just be increased on the upstream's side as well, instead of making everyone reconfigure shitty defaults). It's very easy to exceed the memcached default key value, since it's just 1mb; the maximum size of memcached as a whole is 64mb, which is similarly very low. Outside of that, it works very well and the lack of persistence is great at making it not do things it's not supposed to do (which is a big problem with Redis' feature creep, the projects mainpage promoting AI drivel alone should point towards that.)