I have been researching this on amazon and other places- some of the more expensive ones say they have advanced features? what does that mean? what does a $400 one do that a $40 doesn’t? Unless i can hit a button the $400 one and it actually fixes the problem, otherwise, i can only imagine it has more codes for complex issues?
More expensive probably bidirectional, live data, capture, and maybe manufacturer codes. Cheap, probably just a code reader, maybe some very slow live data.