It is great that mup will soon support windows, but you should take not that it won’t make a difference with your server/os security.
Windows and linux servers alike receive virtually the same kind/amount of attacks, especially from bots. Both operating systems have sufficient last-line security mechanisms in the form of blocking/stealthing unused ports, changing default ports for remote administration (ssh/wmi/rdp etc), enforcing strong passwords, using certificates for logging in and encrypting remote communications.
To be frank, although it may look otherwise, baseline linux security is much easier to achieve. It takes less than 10 minutes and one reboot (just precautionary) to properly secure a linux server on digital ocean, setup remote access, install all updates, necessary packages like git, curl etc and some basic services like nginx and mongodb.