The Nik software collection is a great addition to workflow. I mainly use Silver Efex Pro of all the tools in the suite, but have played a bit with Color Efex Pro too.
The image below I much preferred in mono (as a high contrast Silver Efex Pro edit), but had a play in Color Exex Pro and quite like that result too!
Shooting RAW = spoilt for choice!
When I shoot street with the Fuji X system I limit my choice on purpose by shooting in camera black and white jpegs.... sometimes less choice is better.