I'm assuming you would use Office for Mac:
https://forums.imore.com/e?link=http...token=mXT1bktA
Do you have an iPhone? iPad? If so, there are benefits to having a Mac to compliment them, such as integrated Messaging between all the devices - including the Mac.
The Mac would also probably have less (but not non-existent) worries about ransomware holding your novel hostage
I've had my Mac for a bit over a year, and I'm pretty happy with it. There were some occasional bugs with the newer OSX features back when I first bought it, but most of them work nicely now.