I always recommend full-spectrum CBD products. However consuming small amounts of THC can be an issue for some people, either because they are very sensitive to THC or they have to take drug tests. Generally speaking though, the closer you get to the full plant extract the greater enhancement from the entourage effect you will have for therapeutic potential. Ethan Russo wrote an updated article on the entourage effect in 2019 that is a great read.  Broad-spectrum is close to full spectrum and you will probably still get some synergistic, but not quite as potent as full-spectrum. From a therapeutic potential aspect CBD isolate probably has the least benefits all alone, but still is a very fine molecule that can help children reduce their daily seizures and improve their quality of life.