Each of these is going to come with it's own unique set of benefits.
I am personally a huge fan of Fire Brigade when it comes to managing your data retention policies and troubleshooting a number of index related issues. This has been a really helpful app a number of times for me.
The Distributed Management Console is very useful in giving you a look at indexing rates and various performance related metrics, license usage, topology, and forwarder connections.
Splunk Health Check Overview will give you some good information about search activity and scheduler activity. There may be some overlap between this and the DMC, but it does have it's own unique set of searches and dashboards.
If you were running all 3 of these you'd be able to paint a pretty good picture of your environment.
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