I want to run a short Star Trek game inspired more by Lower Decks and The Orville than TNG or Discovery. I like the Modiphius game a lot but it's a little heavy for what I have in mind.
What systems have you used successfully to run Trek style space opera?
In rough order oldest on top
FASA STRPG (both editions)
Starships & Spacemen (FGU)
Classic Traveller
MegaTraveller
Prime Directive 1E
A homebrewed system derived from FASA STRPG but with very different mechanics of play (d6 dicepool by difficulty for skill or less; Skill ranges from 0 to about 20, with a few characters having up to a 30.)
GURPS (once, one session, it sucked badly... using the SFU G

rime Directive)
LUG TNG/DS9 (combined)
Decipher Trek (1 demo, 3 session 0's that failed to get to session 1)
STA playtest
STA release (Yes, it's different enough that I consider it separate from the initial playtest)
My favorite is PD1E, but it's technically emulating a Tri-Vid show inside an alternate Trek Universe...
My second favorite is LUG-Trek, but I missed a lot of the books. (If Paramount were to offer the whole as a bundle through HumbleBundle or Bundle of Holding at under $50, either directly or via Modiphius, I'd buy it. And run it again.)
Third favorite is STA... I've got almost all of the STA materials. They're very good, but don't work well for many of my players.
S&S ties with STA, but I no longer think of S&S as being Trek; instead, it's about equally different from TOS as
The Orville ... and in a direction different than TNG and Post-TNG trek.
I would NOT consider using Traveller (any edition) again for Trek.