ISO new computer

I have had a SP3, replaced by an HP laptop then returned to the SP7 form factor. I just have a problem with keyboard hinges.

my SP7 just fritzed out. I turned it on and the screen soon went blank tried all the obvious recovery things I found online so I am now in the market for a replacement. I am torn between a SP9 and the SP CoPilot with an Arm. I do think the Arm is the future but unsure I am willing to pay the premium price. I have also read that the Battery Life (which I consider more critical) of the SP CoPilot is not that much better than the SP9 – are there any out here that have some experience with the new SP CoPilot. Would you recommend it over the SP9, Why or Why not?