i'm at the beginning of a node project and need to choose a promises implementation. it seems like when and q are the most often cited, but then i've noticed s

i'm at the beginning of a node project and need to choose a promises implementation. it seems like when and q are the most often cited, but then i've noticed someone mentioning this "bluebird" library. it seems like there are a ton of these things. any advice on which one to pick? does it really make a difference since they all conform to the A+ spec?