Redis vs Memcached object cache: a settled fight, mostly

Redis vs Memcached object cache: a settled fight, mostly
Heard this week: the persistent-object-cache question keeps resurfacing as hosts shuffle their stacks post-acquisition.
— Redis is the default everyone reaches for, persistence and data structures included
— Memcached still shows up on older managed stacks and the occasional budget tier
A source tells us the real story isn't the engine, it's whether your host gives you a dedicated instance or crams you onto a shared one. Word is some discount managed tiers advertise 'object cache' that's really a noisy shared box that flushes under load. Treat 'Redis included' as a question, not an answer, and ask who else is on it.
Watch this: shared-cache disclosure is the next thing a competitor weaponizes in sales decks.