BB (or Blemish Balm creams) tend to be thicker and have more coverage. Many of them have higher SPF, but for this reason, tend to have a whitish or grayish cast.
Tinted moisturizers are more sheer and feel lighter on the skin. They don’t offer the same level of SPF or coverage, but they tend to come in a wider range of skin tones so it’s easier to find a better match for your skin type.