I would make the one who says that explain exactly why it's the best way of life. Why, for example, is it better than the way of life of one who has devoted his or her life to rescuing orphaned and/or suffering animals?
Just think of all the thousands of hours JWs waste on their boring, useless, inefficient, ineffective, poorly taught meetings alone. They could use all that time educating/enlightening themselves, aiding their fellow creatures, contributing something useful to society (instead of being a drain), etc.
The JW way of life is not the best way.