Which Pokémon Go team should you pick?

Instinct, Mystic and Valor. Three teams from which you'll choose. And you'll want to choose wisely. So you've finally reached Level 5 in Pokémon Go. That opens up an entire new world of gameplay. Gyms are now a huge deal. You can actually do things with them. But more important is that you can now join one of three teams. (Remember factions from Ingress? Same sort of thing.) And once you're on a team, it's time to do team stuff. Like get jackets made, come up with a theme song and learn a cool ...