My vote is for the 6.5 PRC. I love the 6.5 SAUM too, but the PRC is here to stay. The SAUM will be about 50fps faster than the PRC with the same powder. I feel like the SAUM will always be up and down in the market as far as support for it goes. It's a great round, but if you can't get brass for it, it's no good to you. The PRC has Hornady backing it, they always do a good job of supporting their cartridges and other popular rounds.