@redfox I've used Tenable for a LONG time. Pretty much their entire suite of products. Cost in the enterprise is going to vary on how many endpoints you have and what solutions you need.

As for effectiveness. I think it it has been and continues to be VM/scanning best of breed. Security Center specifically is highly extensible. It should be easy enough to get started with though may take some time to build out more advanced things.

Alts include Qualys and Rapid7.

Paging @tecnobabble