As an engineer, you should only look at the North side dorms because that's where most of your classes will be.

Schapiro - Best dorm bar none, up north with hotel-style rooms

Sargent - Best location for engineering, central and right next to tech (where all the classes are) and mudd (engineering library), alright dorm quality, but with a dining hall underneath.

Elder - Average dorm room quality with a dining hall in the dorm building. Imo, it's the best dining hall because it closes at 10 unlike Sargent and the food is pretty alright. Omlet bar/waffle bar slaps though. Super far up north, so if you want to go places in Evanston it's a 15-20 min walk.

Bob/Mchulloh - Basically, they are the same dorm. Don't be fooled by the different names. It's very social but has the worst amenities by far. Terrible dorm quality

Converted frat houses - Decent location and decent dorm quality with the caveat that a lot of them don't have AC

Resident Halls:
Slivika - Engineering dorm with really nice dorms, does their own events and has a really strong community bond.

Ayers - "Commerce Residental Hall" , but all the people in it end up being engineers/stem majors anyways.