It would be a rare location, probably highly mineralized canyon, where a 4 watt, 11 meter AM CB would out perform a Ham radio. Even with the 12 watts of a SSB CB, the range is still extremely limited due to the low power and the 11 meter wave length.
That said, I still keep a CB among my collection of radio's, belt and suspenders approach to communications, and some FRS and GMRS radios as well as all my Ham rigs.