This tool is more powerful and specially designed for analyzing system BSODs, crashes, freezes, hangs and unexpected reboots, while SDKs debugger is more for tuning your own written applications. The tool has specially composed system service and host process, which save much more info about crash. For easy analysis there are special templates for the GUI. EFA11 has posted nice link with more information.
Hi there! MS Debug Diagnostic Tool has been updated to v2 Update 1 (v2.1.0.7) microsoft.com/en-us/download/details.aspx?id=42933 (can't post links so Copy/Paste the link)