My experience with CX bikes (Giant TCX) is they steer quick, are not as comfortable and are geared low. In contrast, I have a Giant Revolt Advanced that feels far more stable and rides with noticeably more comfort. The latter is a big thing for long days in the saddle which is what gravel tends to be - at least for me. The Giant Revolt or Cannondale Topstone are great choices and accept much wider tires than any CX bike. For midwest gravel roads, 40mm tires are the middle ground and not too slow for pavement sections. Find a good shop near you and see what they recommend.