Canals are better.

If your character and you are fast enough, and you know the tileset well, Canals are way better than Harbor Bridge. It's a straight shot, no back and forth stuff to clear, a good bit longer so you can get deeper in the mist, and is like 10 levels higher, so the drops aren't hurt nearly as bad.

Harbor Bridge is definitely way easier, Canals consistently gives more rewards (from deep mist kills, not the reward bar(the reward bar can easily get as high though)) if you can handle it as well though.

I prefer running The Ledge

in harbour bridge you can get 28 rewards total

At the end of the day though, you have a pile of ilvl 67 cluster jewels that can't roll some of the better small node gimmes.

it's probably better to pick a t8-10 map with a bog-standard linear layout, or one that's just a roughly oblong run. Dunes, canyon, coves, wasteland - all good.

Favourite these. Buy them and rub orbs on them to get cheap double delirium, run the crap out of them. Most of the loot will be ilvl 75+ so your minor nodes will grant numerically better gimmes.

You'll also have an easier time selling the ones that don't meet your needs.