I think the PRC is a great cartridge. I have a chassis project chambered for it underway. IMO, it's just about perfect for a 6.5.
I like the Mesa over the Ridgeline personally. I brought in a 6.5 Creedmoor Mesa for a good friend and have shot it. It' an impressive rifle. I know of a few carbon barrels that have had issues on the Ridgeline. Christensen is great to back them, but... For the added cost and what advantage that may or may not be had, I think the Mesa is a better choice.
I prefer a CRF rifle for hunting applications. The Montana X3 is everything the Mesa is plus Mauser features, the safety & trigger of a Model 70 and more. The stock, barrel, etc. is very similar to the Mesa but it's a more "solid", smoother action if that makes any sense. Weight are pretty much the same. I have one here in 6.5 PRC someone brought in and wasn't able to take. If you would like photos of it or are interested, shoot me a message.