Well, from what i saw, the razer should be more expensive.
But yes, its really up to you, price worth added battery? Theyre both going to run loud and hot while stressing and components should be very similar, so its just up to you which is worth it. I'd honestly just go cheaper and with the ghost. You should be able to open that one up and upgrade, im pretty sure the razer is like the macbook and pretty much sealed
the MSI is significantly better in performance - if you care about playing triple A games like crysis 3 at high-ultra then it's your better option
if you play things like MMOs etc. then the razer blade is the better option - since there is better cooling and battery life.