I've always felt that if there is one genre of photography that should be shot raw, it's B&W. Color, after all, is either right or wrong - OK, I overstate, you can obviously change colors to achieve artistic intent - but B&W is ALWAYS an artistic interpretation of the scene.
I use Capture One, and it's B&W tool - which allows you to decide on the contribution of Red, Yellow, Green, Cyan, Blue, and Magenta individually - is very powerful and allows dramatic shift to the scene, particularly when coupled with the curve tool.
Now, the Fuji B&W presets are very good, and I can totally respect somebody who prefers to rely on those and just focus on the composition. But I really like the creative control that raw processing gives me.
For example, I was just able to generate this, which is absolutely different than what the OOC JPEG would have been:
Another case in point. My father has spent a lifetime cultivating B&W sensibilities, starting with film, and he always shoots raw:
http://www.hudechrome.com/#!/portfolio/C0000C2wGefslNcA/G0000iCnGkXhw9EI
But then he shoots with a Nikon, which does not have Fuji's presets.
So, you need to decide where your creative passions lie - if you like working with an image in post, to make the tonality your own, then raw is the only way to go. If not, then relying on Fuji's presets would be a good choice.
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http://georgehudetzphotography.smugmug.com/
My Flikr stream:
http://flic.kr/ps/Ay8ka