I've used a bunch of different hulls over the years, mostly AA's, but a few Fiocchi and Remington hulls thrown in for certain loads. I don't think you can go wrong with any of those, although I'm reading/hearing that the newer AA hulls aren't that great. I wouldn't know, as I have several thousand older AA hulls that I'm still using.
I recently started loading nontoxic shot and bought a supply of new hulls from Ballistic Products on sale. These are Fiocchi hulls. So far they seem like very good quality hulls at a very decent price.
I went with Fiocchi because the best cross-section of load recipes in several reloading sources all use them. So far I've been impressed with them.
