It really really depends.
Anthems are made for doing park, but still having the footprint to kill the crud. However, from what I have heard, they still arent the most stable things, and/or the fastest when out of the park. They are made for big booters, and stomping huge landings. They serve their intended purpose well. If you stack them up to other 90+ footprints, they dont do as well when it comes to out of park situations. (for example.. an ARV would be better all around than an athem, but wouldnt be as good in the park perhaps.. where the symmentry of the anthem is dominant)
P.E.s however, are made more to be able to do anything really. Nothing specific, and it is nomaster at anything, but it does everything decently. They are 86 underfoot, which.. depending on where you are is enough footprint for powder (I live in California.. and 86 still seems to work okay in the heavier pow) however, take into mind, it is not a pow shredding device. They are extremely stable from what I've experienced, and even if the snow is not particularly in great shape, they find a way to dig a nice edge. They are very similar to the Scratch FS's I own in how they feel.. but they have just a little more footprint. Really aweosme ski.
Thats the info I have available. use it if you can.