If a person were to evaluate the psychological differences between The Riddler and The Joker, how would they determine which was the greater menace?

NOT JUST THE MOVIE PERFORMANCES.
From the entire Batman universe.

Which villain is a more of a threat to Batman?
Ignoring the fact that he kicks their ass.

The Riddler is more intelligent, but The Joker can fight.
The Riddler hardly uses his intelligence outside of throwing Batman off with riddles.
The Joker seems to live to kill, while The Riddler doesn’t seem to have emotion about killing.
The Joker makes traps and roadblocks for Batman.
The Joke is a psychopath, while The Riddler is a bit OCD.
The Joker LIKES that he is a villain.
The Riddler is actually afraid of himself, but he can’t seem to stop it.
The Joker is fierce. He knows what he wants to do and will stop at nothing to commit the crime that he is set out to do.
But The Riddler also is a bit more sane than The Joker. If he makes a plan, he sticks to it and doesn’t improvise at the last minute.
The Riddler is challenging, while The Joker is ruthless.
I honestly don’t know if I can decide.

Help me out, Fluther.
Who do you think?
Why?