It's a phenomenal song, it really depends on what you look for, i have several of his i would call his 'best' but for different reasons, like best written, best lyrics, best beat, best arrangement, most innovative, one that makes me feel the best etc. But Billie Jean was the song that made me a fan, it made me feel like no music has ever before, i just there unable to understand how much could be so good, everything else i'd heard i'd enjoyed grooved to etc, but this was something else, it really struck through the core, made me feel rhythm still like no other song has. As a bass and keyboards player, well that bass line and all the synth parts are just a joy to play, i've played it at primary school, high school, in my band, at home, at college, everywhere, and i still haven't stopped listening to the record. I don't think it's his best song technically or creatively, but it's deffo his best uptempo for me, and the track that holds such a precious sentimental value