That's a thing I didn't know, Remington doesnt make any 6.5 creedmore.
They make a bunch of 6.5 Creedmoor’s, just not the 6mm Creedmoor.
Back to your original query, while there is probably not a bigger M70 fan here than me, I’d go with the M700 in 243. I prefer the Rem bbl. contour more, and it’s an easier platform to make light in the future should you choose to drop it in a fiberglass stock. I’ve never liked the Long Action M700, but have always liked the Short Action M700. I genuinely don’t like the current M70 MOA trigger, nor the fact “Assembled In Portugal” is stamped on the barrel. I prefer “Product Of Portugal” on my bottles of Port, not my rifles.
I’d go M700 243...