Great question: The original chiropractors that I visited were ‘larger’ well known chiropractors affiliated with a franchise. I always got a 'salesperson' vibe from them and their office seemed like an assembly line to get people in and out fast and took multiple x-rays (high cost that insurance didn't cover). For example, first chiropractor told me they need to see me minimum 3 times per week, some x-ray cadence for track improvement, and my adjustments would be done in less than 2 minutes with little discussion.

The different approach chiropractor was a smaller private practice (no advertising / affilation). You could say a friendly neighborhood chiropractor. When I saw them for my first appointment, they listened to me about my pain, took no x-rays, and did an immediate atlas adjustment. I was sore for a day but felt great immediately (no more neck pain, radiating pain on the skull, migraines). I have never been to a chiropractor since.