Thanks, grmi66.
Highlands, while a great school, is not a walkable and serves a nice mid-century to modern day neighborhood of foothills homes.
Longfellow and Washington are in the heart of the north end. I'd personally choose Washington first because I like the area of the north end west of 13th from a housing perspective. Further west is Longfellow. It's also a great school but hits some parts of the north end outside of north end proper. Their test scores won't be as high as Longfellow and Washington but that's because they serve more of a mix socioeconomically. They do have awesome parent involvement and wonderful teachers.
If choosing between Highlands/Longfellow/Washington, housing will be your main consideration as the schools are all very strong--you can't go wrong.