Dean Koontz writes better books and he is a conservative.
Truth be told, I never liked Koontz as much as I liked King - when King was on.
King wrote some very good books in his youth, regardless of his politics. I loved The Stand, IT, and I think that the first book of the Dark Tower series was probably his finest work and might well be studied as a lesson in minimalism.
I think King’s writing started repeating itself some time ago, and his new stuff (ie the cell) is not as good as his older stuff.
I despise the man’s politics, but back in the day he really was quite the author.