Which is more recommended, adrenal glandular or cortisone/prednisolone?

Neither. Actually, more Prednisone is used than either of the other 2 meds. Cortisone has been the traditionally used med but must be given several times daily. Prednisone and Prednisolone can usually be given once daily. Also, because cortisone causes some salt retention, it is better for those with low blood pressure while the others are better for those with higher blood pressure.