I can't say for certain what episode I'll have seen first, but one that always sticks in my mind most was Balance of Terror. Being mixed race (South Asian) growing up in an almost entirely white area, it's when Spock became my childhood hero. (That episode became even more resonant after 9/11 and the subsequent massive increase in overt Islamophobia).
In the UK, we didn't get TNG until 1990, and I was 8. I definitely seen some TOS and films by then (for a start, I definitely saw Final Frontier at cinema around release).
Grew up on TNG though, and had many of the playmates figures, shuttle Goddard, Enterpise-D toy, Klingon Vorcha class, Romulan Warbird and Transporter. Always wanted bridge, bit never got it. I might have identified with Spock more than I did Data, but the TNG cast pretty much became my second family.
DS9 became my favourite in my teens (after a lukewarm reception at first).
Enjoyed Voyager, but not as much as the others, and was extremely disappointed with Ent, but carried on watching (and never totally hated it).
In the days of the DVD, Imade sure I caught up on any Trek I hadn't seen. (Including TAS, which I'd only ever caught on a rare occasion). I remember specifically hearing a lot about Spock's Brain... but any time it appeared on TV guides, it was followed by "Except in Yorkshire and Linconshire, who will receive the Super League Show".

(Yes I'm from Yorkshire, and hate bloody rugby).
Anyway, I've enjoyed most Trek. The Kelvin films are my least favourite, but I was still entertained. To this day, I wish they hadn't doubled down on them being a spin-off from the Prime universe, and just let them be their own thing.
I have no problem with any of the new shows being real Trek, or any of the inconsistencies stopping them being Prime. (I think of them all as perhaps far future dramatisations of Federation History, not necessarily all with the same slant, and with artistic licence being taken here and there).
Picard is definitely the series I've been most excited about new episodes of, followed by the first couple of seasons of Disco. 25th century follow ups are absolutely what I want more of. Yes, I would like a Legacy series, but even a new cast in that era would music to my ears.