They’re both good for everyone and they’re different!
Biodynamic craniosacral work is supporting the client’s own system to regulate and balance itself, but without any physical manipulation on my part whereas in massage or fascial release work I’m applying pressure and movement to the client’s tissues, with the aim of creating a change. It’s worth noting though that the pressure I use in massage is relatively modest and I’m responding to the restrictions which I feel in the client’s connective tissues.
I would suggest that if you have a specific localised physical problem, such as a painful knee or shoulder, it may be worth trying a massage/myofascial session first. If your health issue is more generalised, such as fibromyalgia, IBS or chronic fatigue, and/or you feel there’s a psychological or emotional element to the problem, eg it’s brought on or worsens when life feels overwhelming or just too stressful, then I would suggest trying craniosacral therapy.