Neither do your picks. There's barely any screentime for Kira in any of them, same with Quark, Odo's role in T&T is forgettable and I don't even remember if he's in any of the other episodes, and I don't remember Garak or any other recurring character featuring in any of them, apart from Weyoun in TTD. They just show off Dax, Worf, Sisko, Jake, O'Brien and Bashir.
"Duet" is mostly a story between Kira and the imprisoned Cardassian, and "In the Pale Moonlight" is mostly a Sisko and Garak story.
"The Visitor" is a Ben and Jake story, and "You Are Cordially Invited" is a Dax and Worf story. And I happen to think that "Duet" and "In the Pale Moonlight" are better than both. "The Visitor" is a nice story, but although I've included it in my list as it is accessible and standalone, I think it's a bit overrated.
I did explain that
"The Visitor" is the one episode I picked not for using the whole cast well, but for its emotional impact. I also pointed out that even though
"You are Cordially Invited..." is mostly about Worf and Dax, I think it shows off the rest of the cast nicely.
To be more specific, it has Sisko, Bashir, and O'Brien bonding as part of Worf's 'bachelor party', Kira having good conversations with Jake and Dax about career and marriage respectively, and some nice insights from Martok about marriage as well.
There's no use arguing about
"Duet". I agree to disagree with everyone on it. I seem to be the only who sees it as a mostly boring episode often consisting of Kira stomping around whining, with the only bright spots being those scenes where the prisoner guest star delivers some truly awesome rants. But one great guest performance does not a classic make.
Odo teases Worf in
"Trials and Tribble-Ations", and since I like him more when he's lightening up (instead of being grumpy most of the time), I think that's one of his better appearances. Yes, Quark is marginalized in that episode and
"To the Death", but you mentioned yourself how many characters that episode gives screentime to, and most of them get great dialog or moments within.
With such a big cast, it's impossible for most episodes to spotlight
all of them and Quark is definitely a presence in
"You Are Cordially Invited..." doing one of the things he does best - making snide observational comments about other characters from the side.
I'll admit I'm a little biased. Episodes don't have to feature Quark, Kira, and Odo heavily for me to consider them among the best since they're my least favourite characters. I don't really dislike Quark, I just don't like him as much as many other characters (and I love
"Little Green Men" by the way). Oddly enough, despite my lack of affection for Kira and Odo,
"His Way" is one of my favourites too.