Black Friday digital download as Christmas present

[newusern99]

My son wants a Microsoft game (Xbox/ pc but he has a pc) for Christmas. It’s reduced for Black Friday on both Microsoft store and Argos. If I buy the digital download now will it still work after Christmas if I just print out the email as the present?
wpuld Argos or Microsoft tore or steam be best to use?

I thibk if you did it on steam it would go to your account ;though steam gifts is a thing). No key would be sent (a 25 digit code)

Same buying it from Microsoft -direct injection to your Xbox console
Buying a digital code from Argos would get you a code (on email or in a box sometimes) to give to another.