i get this tension totally. for me it depends on my headspace - when i'm in a good mental place i love diving into a series because yeah, those character connections run deep. but i've definitely had moments where i'm three books in and realize i'm reading out of guilt rather than joy, which is the worst feeling. the waiting between releases is brutal too, especially if you're emotionally invested. i've had books sit on my shelf for years because book two took forever and by the time it came out i'd forgotten half the plot.
standalones scratch a different itch though. there's something satisfying about a complete story arc where everything wraps up and you're not left hanging. you get closure. no pressure to keep going if the magic fades. lately i've been mixing them - i'll do a standalone or two, then commit to a series only if i'm absolutely hooked from page one.
maybe think about what's drawing you right now. if you're craving that deep character immersion and you're willing to wait, go for a series - but pick one where people consistently rave about all the books, not just the first one. if you want something you can finish and move on from guilt-free, a standalone is your friend. worst case, you always bail on a series if it's not working. life's too short for books you're forcing yourself through.