I've seen all the plays you've listed and would definitely recommend The Little Foxes as my #1 choice, especially if you can see Linney as Regina/Nixon as Birdie. It is an engrossing production with amazing quality in all aspects. Behind that by a fairly large margin, I'd probably say Present Laughter or Indecent. I found Kevin Kline and Kate Burton to be knockouts, but the first act is a little draggy at some parts. I found Indecent had similar pacing issues at the beginning but no standout performances for me. Both have fantastic endings in my opinion, Indecent probably superior in the story aspect. Finally, Oslo is good (and the tony winner), but I refrain from saying great. Good performances, good staging... but I left feeling underwhelmed when compared to other productions I saw (I say this as a history and politics enthusiast as well so I'm surprised). Same goes for Sweat for me. I can't speak for Come From Away for now because I'm not seeing it until this weekend.
Enjoy A Doll's House especially, one of my very favorite productions this season!