If you like b5, then DS9. Long drawn out story, more character evolution, more shades of grey.

If you like the orville, then tng, be prepared for early installment weirdness, it literally coined the phrase "grew the beard" because its levelling up coincided with Riker growing one. Lower decks also works

If you're experienced with 60's stuff like Man from U.N.C.L.E, tos will do.

If you're a 90's kid, ENT

If you're a 00's kid, SNW. Lower decks also works

Voyager is for more experienced trekkers, but they do batshit like no other