I honestly do not think any chameleon is "better" than the other but what I do perceive is that the more expensive the chameleon the more hype around it.
When you look at a Panther chameleon you see a very colorful, personable and active animal yet there is no major structural ornamentation. They are a rather "basic shape" chameleon but they cost you $200 and up.
Now look at a Montium or a Deremensis. Talk about impressive! Horns, sailfins, beautiful shades of colors and patterns and also personable in their own way. However their price can be as low as $75 each if not lower.
If someone has the money to spend $300 in a chameleon, you can be almost certain that the person will try to take better care for that chameleon because it cost that much. Therefore, the more the person interacts with the chameleon, the more they fall in love with it and the more popularity it gains.
A "cheap" chameleon becomes an expendable one and if it dies, the owner simply goes out to replace it. This doesn't leave any room for an effort in taking proper care of the animal, establishing it and the ensuing bond that happens.
I can't say for certain but seems like if every chameleon would command at least a $100 price tag their care in captivity might be better by the general hobbyist and thus all species would be "the one to have".
Just my opinion though.