None. Belarc is to be used "in addition to" not "instead of"
Unless I misunderstood your asking the advantage of using Belarc "over" Windows Update, Belarc wasn't meant to replace Windows Update. But to be used in addition to.
I believe the operative words are 'missing Microsoft Updates'. Belarc reports "missing" (and installed) security updates and hotfixes. You may know which ones are missing (and why) from your system. And I may know which one's are missing too. But not everyone does. That's where Belarc enters the picture.
I haven't used it in quite some time. But most use it as a system information tool to identify hardware and software installed on their systems. To include product keys.
Or as described by Belarc, 'it builds a detailed profile of your installed software and hardware, network inventory, missing Microsoft hotfixes, anti-virus status, security benchmarks,...'
A caveat: When I post updates, it doesn't necessarily mean I use or recommend the product. I post them because enough people do, where I feel it warrants posting the information. Unfortunately, I don't have enough time to keep up with all the updates.
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