Mill
“difference between that and Shita Mekubetzes, which does the same thing to the rishonim, but I don’t recall his answer
Huge difference, asides that the shitah is in itself like a rishon, the Shitah is quoting the entire text of the rishonim and, many times Rishonim that are not even available.
Nothing of the יגיע or of the process is lost in its qoute..
Whereas, Otzar is just summarizing various meforshim.