Of the 2 choices, the Remmy 700 for sure.

BUT......as was previously posted, you can get quite a bit of money tied up in getting the 700 "tweaked" to where it needs to be.

I was just in the same boat as you...trying to decide on an action to start a custom build.

After I looked at everything, I wound up buying a Stiller Predator action.
Super tight tolerences, already "tweaked", got a Jewell trigger to go with it, and was able to DRIVE to Jerry's shop and pick it up instead of doing it all through the mail.
If you're intersted, contact Jerry at SPF (Stiller's Precision Firearms) in Wylie, TX. He was a super good guy to deal with.