I would advice you against multisite. It's absolute pain to do anything with it.
As I said many times to my clients, I would rather develop a plugin (for free) to sync users and allow you to switch between websites, than use multisite. Hate that thing. Absolute abomination.
And yes, we have quite a few multisites to manage, but all because we acquired the clients and projects. None created by us. There is not a single reason for me to use multisite.