If you’re asking yourself the question which of the current directory tools to chose, here is some help:
I found this nice overview in the Azure MSDN library documentation:
https://msdn.microsoft.com/en-us/library/azure/dn757582.aspx
On that documentation still FIM 2010 R2 with WAAD Connector is listed as an option, but you should not use that for any new deployments anymore, beside you have very special requirements (like multitenant) and only using that scenario as in interim solution until AADConnect will support that in future.
JustIDM 