From my experience turbolink 4.0 has about as much as datamaster when it comes to displayed data points. It also has the trending option and DTC display. It doesn't have the histogram like datamaster, which I use quite often. I also personally don't care for the dash display vs. a no nonsense display like datamasters. Overall it comes down to personal preference, but heed my warning make sure you have a laptop with a serial port turbolink doesn't like adapters.