Siri vs. Cortana vs. ‘OK Google’: Who’s better, who’s best

SAN FRANCISCO (AP) — Cortana’s learning the neighborhood. Google’s digital assistant can’t tell a joke. And Siri apparently has a thing for the metric system.
Those are just a few of the things I learned after staging a face-off between the three leading digital assistants. Apple’s Siri and “OK Google” — they’re not big on personification at Google — are now standard on smartphones; Microsoft recently added its Cortana service to Window