I voted for the Nicholas Meyer directed films. They're just the most watchable imho, & there's a solid reason why they bookend the series of films that took place after they changed things up, post-TMP
I don't want to bash TMP, because it's great in some ways, but it's the least watchable imho, because it suffers from being too self-important. It's trying too hard to be the lofty high art that its creator & its fanbase had begun considering it, at that time
As a result, it's visually long winded. It has a real pacing issue, & there's a lot in there that is just pointless. Frankly, Decker & Ilia are just a waste of screen time, left from a chewed up old Phase II concept. They are characters no one has cared about, either before the film nor after, not the audience, nor the other characters. Couple that with the choice to use so much FX porn & you drag the movie down, even though some of those FX are visionary.
Now, a lot was sacrificed in the move that happened between TMP & TWoK, because it switched from an event based concept to a character based one. TWoK & pretty much everything that came after for them, are not telling stories of discovery or sci-fi phenomena, the same way the series did. There is some of that in there, but they instead gear those films primarily around being character driven.
More character growth happens to those people in the 9 hours of film between TWoK & TUC than in the entirety of the 79 televised episodes they appeared in, & clearly that's what audiences wanted, to better know these people we'd grown to love, to know their sons & brothers, their enemies, their bonds with one another... their world.
TWoK & TUC give us the best of that imho, enough so that it has shaped the entire franchise ever since, especially the new cast's modern incarnation. It IS the new formula, because of those two films, and to some extent, what came between them