Re-using the GPU in the new system, or keeping it with the old one? Because if you have a GPU, I would spend a little more ($140 at newegg) and get a Ryzen 2600, 6c/12t instead of the 3200g 4c/4t.
Well, since the OEM copy of Windows can only be used for one motherboard (and a few components I believe), I'd rather keep the 1050Ti for my Win7 machine. I want to keep Win7 after Windows stops the support next year because I like the desktop/menu and it's compatible with all my old games.