Do I need a Bluetooth OBD2 scanner or a handheld one?

Bluetooth dongles like BlueDriver and OBDLink MX+ are cheaper, easier to update, and give richer graphing through a phone app. Handhelds like the FOXWELL NT301 or Autel AL319 work standalone with no app, no subscription, and no battery worries — better if you want a tool that lives in the glove box and just works when the check engine light comes on.