I own a Kona Rove which probably falls in the "gravel grinder" category. I am a little slower on it than my road bike (not sure that would be true if I swapped out the 32s for 23s), but the steel frame and bigger tires make it a super comfortable ride on crappy roads. Besides what others have mentioned, it has slightly longer chain stays than hard-core CK bikes, plus it can take a rack and handle some light touring.

If I could have only one bike (good gawd no!), it might be the one I'd choose because of its versatility.