Those are all intended for paint stripping and general handyman type applications. They're not suited for pcb rework, although people have occasionally tried to use them that way out of ignorance, desperation, or as a joke (most videos are in the last category...they only do as well as they do because they're already experts).
You need stable temperature control, air flow control, and an appropriate nozzle for the task. Your general purpose nozzle is probably going to be smaller than your little finger.