ABD has balanced stands, balanced stats, and balanced gameplay. Other than PJJ, you can add blessings, fusions, subspecs, and etc. In ABD you can't do that much and that what makes ABD fair.
I think ABD is way much better since is fair and not broken unlike PJJ where some people can even stop time for ages and the PVP sistem is not well made cuz like almost anything can one shot you there. Plus animations in ABD are way better than PJJ.