Respectability is more individual than industry. No one aspect of sex work is inherently more respectable than others. It has more to do with the worker. A prostitute can be more respectable than a cam girl even though the cam girl never has sex with her clients.
I voted masseuse because of the happy ending. There's no teasing or having to finish myself off. But my level of respect for all four is pretty close to even.
Those who got out of the industry after being forced into it r the most respectable. I don't see the free choice to enter sex work as more respectable than being lots of other kinds of 'worker'. If sex workers by choice want 2 look 'respectable', they need to choose a new job.