how do you handle state in microservices tho, like whats your strategy

hey everyone, ive been thinking a lot abt state management as we scale up our microservices. keeping track of session data, user prefs, or even just temp flags across diff services can get messy fast. are you guys leaning towards using dedicated state stores like redis or memcached, or do you prefer to keep state within the services themselves, maybe in their own dbs? what are the trade-offs youve found most significant