I've tried both and have had success with both. The difference for me is the time. When I scramble it takes a little more brushing/combing to set my pattern. Spread, less brushing, I spread more often cause I don't have the time I want go scramble.
But overall what ever works better for the individual is the best pick. Most wavers have to do both anyway cause it would be pretty weird to hear a waver scrambles during their fresh cut weeks but idk maybe somebody having success it doing that lol.