HJs are quite fun... it's like a JOI video come to life... especially because I love the art of the tease.  
CBJs aren't really my thing, although I'll absolutely give one if my client wants it.  
But personally, I take the art of fellatio very seriously... but then again, I'm a giver. Also, most men feel so powerful in that moment but in reality they are quite vulnerable... there's a subtle domme vibe to it that I enjoy.