I have all of the packs and IMO, they're ALL very good.....you really can't go wrong. I like to mix/match different packs with various midi packs as well......there's a lot to work with as far as creativity is concerned.
Best is to listen to all the demo's and see which suits your fancy..........I couldn't make up my mind either and ended up fancying them all.
Session Percussion gives a variety to the rest with some Latino/Caribbean feel.......as I wanted variety.......good stuff!!