Never used Hornady but I bet WW or RP makes it for them and stamps it Hornady.
RP is thicker and softer so pressures run very slightly higher than WW with the same powder charge.
WW is thin and hard and tends to crack in the necks with fewer loadings than RP does. On the up side WW is way better for necking 308 down to 7mm/08 and other such neck alterations because the necks don't thicken up and need turning so much.
Overall I like RP best. I get more loadings from RP cases than any other brand except Federal match cases.