How do I buy the best pork?

How do I ensure that I'm purchasing the best pork available? Is there a specific breed or cut that I should be looking for? What factors should I consider when selecting pork, such as freshness, color, and fat content? Are there any red flags to avoid, like a strong odor or discoloration? Additionally, are there any reliable resources or tips that can help me make an informed decision when buying pork?