I think jazz is too big a category to get into 'best' lists. everyone has their preferred area - big band, swing, dixieland, bebop, free jazz, vocals etc. It makes more sense to figure out what pulls your chain, then find others who are into that particular area, then get their 'best' list. a free jazz fan's 'best' llist is going to be a very different animal than a big band affecianado!