I have C-Products and PRI. Got a deal on the PRI, IIRC it was 15 for $300, so anticipating a big bore rifle, I grabbed them.
IMO, since I have used C-Products with zero issues, I can't see paying $43 (or now $25) for a PRI.
Even at the sale price, I can get 5 C-Products for the cost of 2 PRI. Before sale, you could get 12 C-Products for the cost of 3 PRI mags.
So . . . . C-Products, but $25 for a PRI is good. IIRC, PRI mags allow longer COAL if you are reloading (and I am with three rifles in 6.8)