Not that I’ve ever really gone in for comparing the two (oh, remember the days when that was the most contentious question in all of “Fandom?” how little did we know…) but I always felt that the comparison was ONLY fair when you took the very best of each series and measured those two, AT their best, against each other.
I will say this, the only area in which I think there’s no real argument whatsoever is that Star Wars has better music. That’s the only aspect where I don’t think there’s any contest at all.
Apples and oranges for me.
Star Wars film scores are much more consistent. But Jerry Goldsmith’s score for Star Trek: The Motion Picture is, in my mind anyway, as good as anything John Williams has written.