“Which is safer spinal or general anesthesia?”

Both options are safe. Sometimes one can be better or safer than the other depending on underlying health conditions. A general is more likely to cause nausea and a sore throat. A spinal carries a small risk of getting a headache, and also, though you would typically be sedated to the point of a nap, you might remember being in the operating room.

It depends on the type of surgery and medical problems that you have. Only evidence we have is spinal is better than general anesthetic for c section. In an otherwise young and healthy person, it is personal preference of the patient, surgeon, and anesthesiologist what you decide.