Albert King is a favorite, I love his playing style. Lonnie Brooks is another one I really enjoy. Of course Clapton, Vaughn, a little bit of BB King(I need to listen to more of his stuff). Janiva Magness and Robin Rogers: two female blues singers with great smoky voices. I would say my favorite blues style is Chicago Blues. I absolutely love Rory Gallagher (Irish blues-rock singer/guitarist).
I need to expand more. I listen to my favorites, but there's so much left to explore. For example, I haven't yet heard Muddy Water, Howlin Wolf, etc. That's a goal down the line.