[thinkbohemian]

I would say depending on what you're looking at they're complimentary. NR can give you some really in-depth timing information such as how much time is spent in the DB versus garbage collection on a certain request. The metrics here are very high level, response time, memory usage, CPU load, etc. New Relic doesn't have the ability to be as precise with its system resource measurements inside of the Dyno so they're both very useful.