In-cam noise reduction is a quick way to deal with noise in the video. However, it can reduce the quality of your video: you may lose some of the fine details. In-cam noise reduction and codec can also make it harder to remove the residual and repeated noise left behind.
Neat Video as an in-post denoiser will take some of your time for adjusting filters and rendering, but the quality of the final product will be better. It can also help with flicker, jitter of details and some other problems you may run into, so you will be able to get a few birds with one stone. Read more