When choosing where to go, consider what features are most important to you, like fun stickers and interaction or end-to-end encryption. If you are primarily talking to family members, ask about what they’re already using and consider their ability to learn a new tool. If they’re in a different country, they might be on an app that’s hugely popular there but not in the United States, such as Line, WeChat or Viber. (They may be less secure, so weigh your reasons for switching.)