For someone intending to be a doctor , is it better to enter a MD or phD or a MD-phD programm?

I'm really confused, i need help me to clarify my mind ,although that i have read going on for them,i still did not get it right.

Answers:

MD: Medical Doctor. You can prescribe medication... Generally help others deal beside their health.

PhD: Doctor of Philosophy. You have expertise in a given subject, ie Paleontology, Engineering, etc...