Good B&W conversions aren't really done from RAW, it's done mostly from channel mixer, filter, other colour related settings once you've got a good colour photo loaded up in your image editor. Basically, it's the photoshop equivalent of putting various colour filters on a B&W film camera when taking the photo, then working some darkroom magic to finalize the negative & print.
This tutorial gives a pretty good overview on how all the various conversion methods work along with the end results.
There is no one ideal method, everything changes depending on the photo you're starting with and the result you want.
https://www.photoshopessentials.com/photo-editing/black-and-white-tutorials/black-and-white-intro/