Having been reading up on the "new" 6.5mm PRC, i'm leaning towards it.
All of this caliber-chasing is fine if you are looking for a particular result that can only be given to you by a very specific caliber, but otherwise, it is just that, caliber-chasing.
Few of us use our given calibers to their full potential. We are operating well inside of the envelope of their capabilities and often the differences between the calibers are pretty darned small in the grand scheme. I know that I am not making kills with my 6.5 Grendel at 500-700 yards and mostly shoot it inside 200 when hunting. There are a LOT of other calibers that will work very well for my needs. I have yet to ever even consider bison hunting with my .45-70, but shot a bunch of hogs with it. Again, lots of other calibers will handle that task just fine.
The question I ask people before they make such new purchases is what exactly is having the new _____ (in this case, caliber) caliber going to resolve for you that your other owned _____ (calibers) aren't doing for you? In most cases, the query is followed up by, Is the tiny difference really worth all the expense, or are you just wanting to buy something new? Nothing wrong with wanting to buy something new, but sometimes we go overboard in self-delusion that the new purchase is truly needed and often is the case that it is not.
Now, I did make the change to 6.5 Grendel from larger bore .308 and .45-70 due to medical issues I had at the time (doc said I needed to limit recoil impacts on my body for many weeks). There were multiple choices of calibers with less recoil that I could have chosen that would all meet my needs. I happened to go with Grendel as a buddy had it and spoke highly of it, but I could have gone with 6.8 SPC and it would have met my needs equally well for the task at hand. And then I went heavy barrel and some other things to help reduce the recoil even further.
Buy what you like, but from what I have seen time and time again, unless you are really using a given caliber to resolve a particular performance issue, chances are it isn't all that different from others you already have in the safe. So you need an extra 2-4" of elevation at 300 yards with one you already own, is that really such a burden?