As a contractor one jumps between different installations of drupal for different clients. Often the architecture is baked in and needs to be maintained. My experience tells me caching solution used are, in order of frequency, 1) memcached 2) memcached and varnish. Drupal + redis as a caching solution is not prevalent even though it is free, opensource and more feature rich. I like to know why? Were Memcached and varnish available before redis? This is the answer I come up with talking to collages but seems too simple.

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    Welcome to Drupal Answers :) Varnish is a reverse proxy, while redis and memcache are in-memory caches; they serve different purposes and Varnish can't really be compared to the others. Redis is very much prevalent in my experience, it just depends where you host and/or who set it up. For example, Platform.sh and Pantheon use Redis, while Acquia offer Memcache instead. Whether that choice came down to available knowledge resource at the time, better integration with the platform stack, fashion trends, or something else, it's nigh on impossible to say. But both are quite widely used – Clive May 15 '19 at 18:58
  • Thank you Clive, looks like i need to study up on this. – Casey Carnnia May 16 '19 at 15:27

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