Main differences are price and some have built in power supplies and some have just the controller unit. I recommend the ones without the built in power supply because they may be cheap, underpowered, and can be dangerous (not certified, tested, etc). You’re better off getting a quality Dell, HP, or Lenovo laptop power supply rated for 90 watts 19.5v and 4.5 amps minimum. It just needs the 5.5mmx2.1mmmm connector.