Good question, but the answer is more about who the orthodontist is than what system is better. I think the public is under a misconception that Invisalign is Invisalign, and SureSmile is SureSmile. It's not about that, it's about the Dentist! How good is HE? Many orthodontists...
Most orthodontic problems are a combination of a tooth problem and a skeletal problem. This is why it is easier to fix problems in growing kids rather than adults.Nobody has a perfect skeletal alignment..but orthodontists can move the teeth to compensate for the bones being out of place...
Your orthodontist is correct. Your teeth are triangular in shape and therefore only touch each other with minimal surface area. If your teeth were more rectangular in shape then the teeth would touch with broader surface area and thus appear to be closer together. You can fix your perception of...