When comparing New Relic vs Data Dog, the Slant community recommends New Relic for most people. In the question“What are the best server performance monitoring tools?” New Relic is ranked 1st while Data Dog is ranked 11th.
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Pros
Pro Limited free tier
5 VMs with 24h history and no alerts for free.
Pro Docker support
The Datadog Agent container runs with the other containers on a host. It collects metrics from neighboring containers and from the host. It can monitor 10 or 20 containers free per host license.
Cons
Con Very expensive
$200 per host per month is a lot.
Con Support quotas
Customers are not treated equally regarding support.
Con $15/host/month is quite expensive
If you are running big fat systems which are probably bare metal, DataDog may be a very good fit. But if you are running small virtual machines you may discover that its somewhat expensive price can become a real problem.