I reckon you should rethink your strategy. Try to convert your friend to MSFT services first, then think about converting to a W10 device as a natural evolution. Start with Skype, OneDrive, Office 365, Cortana, Microsoft Health + Band 2, perhaps Groove (unlike some, I actually like it), Xbox. Then start thinking about showing what benefits your friend would realize when switching to a native W10 device - that would help lessen some of the app gap pain.
My thoughts why your friend should jump the ship:
- services (full office includes 1TB of OneDrive storage) - nice to have
- price - 950XL is a tall order, I'd start with 640XL or 650. Neither is an impulse buy, but won't break the bank either. 2nd most important for me
- privacy - read MSFT's and GOOG's privacy agreements - #1 reason for me
MSFT collects a ton of data on me with my consent, but their privacy statement clearly states that they will not use that data sell me advertising.
Unlike GOOG, who makes their living off of it. If you use Android, you are the product, no the devices or services they sell to you.
This in and of itself is the primary reason I will never use Google's services, it's their sheer pervasiveness. Having worked in data privacy field for several years, I've grown cautious. Google's privacy agreement is one of the most egregious. You simply give up your rights to privacy.
May be their execs have the right intents, but it takes only one evil mind to reverse all of it years later. I agree with Musk - there is only one company to fear when it comes to data intelligence.
I even cringe when having to use Instagram, because my relatives do. I keep it private, don't share location and use a 3rd party 6tag app whenever I can.