There are notable differences
the main one being the big fight scene between Hector and Achilles, but also, there are messes with the score during certain scenes where you can tell the Director rushed to edit it all together in the extended cut and there wasn't a lot of thought put into it. Some of the music booms in moments that would be better off quiet, for example.
Overall though, I can look past that for the good scenes that were put back into the movie
stuff with Odysseus, plus Hector seems more angry towards Paris in the EV.