15 or 17?

Hi everyone so I'm going to get the following config and wondering if there's any disadvantages to the 15 over the 17. I've owned an AP M15x and a M17x R4 so of course I'm familiar with size and lack of numpad. The config I want is:

6820HK, 980GTX, PCI SSD, 4K screen

In these respects the two machines are the same, I'm wondering about SSD slots (the 17 R3 has 2, how many does the 15 have?)

Power requirements (is the 15 going to throttle if I crank it up?)

Screen Quality - of course the 15.4 UHD is higher dot pitch, but what about colour quality? Are they 6bpc screens like the M17x R4? Colour quality is a deciding factor for me.

RAM - I'm looking to go for 32GB - I assume both are capable?

SSD - I'd like to have a sata boot as a fallback/compatibility choice and use the PCI SSD as a data drive - This seems identical on the 17 also (sata and PCI SSD)..

Anything else I didn't think of?

Thanks for any feedback!

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15 or 17?