What is the best type of dog leash for everyday walking?

Across the reviewers we read, a 6-foot flat nylon leash with a padded main handle and a second "traffic" handle near the clip is the most-recommended everyday choice. nytimes.com's product desk has favored the double-handle flat-nylon style since 2017, and r/Dogtraining commenters repeatedly call the second handle 'essential' for keeping a dog close in traffic.