Fear is quicker, respect is forever.

I can tell you from my military experience which leadership model is more effective. Soldiers will do literally anything for a leader they have deep respect for.

Love and respect.

"There is no fear in love; but perfect love casts out fear, because fear involves punishment, and the one who fears is not perfected in love."

1 John 4:18

Respect, without a doubt the most dependable motivator. I don't belive fear is motivating, although it can make thing get done