As the Product Manager for DMC, I have a bit of a bias but here is my take:
DMC is the only Splunk Monitoring solution that has the full weight of Splunk Engineering, Sustaining, Support, and Documentation behind it
DMC ships with the product out-of-the box
DMC strives to be comprehensive of all Splunk sub-systems (Search Head Clustering, Forwarders, etc)
DMC has pro-active alerting built in through the Platform Alert mechanism
That said, I love the fact that the platform exposes enough information through logs, metrics, and introspection that the community can build useful views and features for customers that the Splunk product team may not have dreamed up yet. In fact, the DMC product and engineering teams have collaborated with the maintainers of those two Apps for entire sections of DMC and ideas on how to make DMC better. The Indexes and Volumes section of DMC is almost all built with Fire Brigade as inspiration and we've drawn many ideas from Health Check about how to better surface search activity.
As far as I know, it is non-intrusive to have all of them installed so fortunately it is not one or the other if you like certain features of each.
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