Do you think they make the best parents?
How can that be when you force your child to become a clone? That has been proven over and over again to be the kiss of death.
The best children?
In whose eyes? To the JW parents I'm sure they are tickled pink when their child obeys. Of course, fear is not a motivator I want for my children.
The best workers?
JWs are all about obeying rules and using superficial methods to convert more people. What happens when the door is closed is a whole 'nother situation. If they will get praise or credit from their fellow JWs (via doing good things at work and getting praise from their bosses) then absolutely.
The most moral?
Morals, based on whose value system? JWs or conservative Christians? Sure, it is again, all about what others see.