IF you do get the MAC PRO, make sure you have MS Word loaded if not the complete MS Office.
We own and use both MAC PRO and a Windows 10. I will not advise you either way except to say IT WILL COST YOU A LOT MORE MONEY TO DO THE SAME THING ON A MAC.
If you want the computer to marry up with you iPhone and iPad then probably the MAC.
I love your writings so and I know you will choose wisely.