Gap because this one is impossible to answer. I can't even decide on my favourite type of DS9 episode.
Because you've got the various Kira / Bajor healing ones, or not healing and sometimes you can't go back and the difference between Shakar and Nalas, and the people in between. Then you have the Founder episodes or the Jem Hadar episodes and the Vorta episodes and religion and death and (oddly enough things they share with the Bajoran episodes). Or the Sisko episodes. Or the one where Martok has PTSD and Klingons not really knowing how to cope with that.
( The other days under the cut )
Because you've got the various Kira / Bajor healing ones, or not healing and sometimes you can't go back and the difference between Shakar and Nalas, and the people in between. Then you have the Founder episodes or the Jem Hadar episodes and the Vorta episodes and religion and death and (oddly enough things they share with the Bajoran episodes). Or the Sisko episodes. Or the one where Martok has PTSD and Klingons not really knowing how to cope with that.
( The other days under the cut )