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I was curious to know, what seforim do yeshiva bochurim learn in yeshiva? (i.e. Kovetz Mefarshim, Shita MiKubetzes and Chiddushei HaRan etc.)
I have learnt by Rav Meir Stern-one of the greatest Roshei Yeshiva in America. He was attached to all the Rambams on the sugya. He did discuss many Rans as well.
That's regarding the Rishonim. Achron that he said over often was the Birchas Shmuel.