I haven't read either author lately, but I've read of few books written by each of them (though it has been years and YEARS).
Stephen King offers a much greater variety than any other author I know. Plus, he is an EXTREMELY
gifted writer -- more gifted than a great number of other authors who I deem to be excellent. Love him or hate him, I think Stephen King is an unmatched enigma and cannot really be compared to anyone else. There was one book of his that I just could not bring myself to finish and even found myself disposing of because I was so unnerved by--ahem--It
that I did not even want the harmless written text under the same roof as me. I absolutely LOVED The Green Mile
though and enjoyed many of King's other books, too.
That said, I have also enjoyed a few of Dean Koontz's books, particularly Intensity
. He is a very gifted story-teller and continuously kept me on edge and unable to step away from his story, from beginning to end.