i thinking unison is much better and i should just trigger with a movement with my lower body or legs.
if i take my racket first I have all sorts of problems with my toss
if I toss first I have all sorts of problems with my timing of my racket arm.
On the deuce side I feel if I can swing a bit faster with my racket arm during the serve.
On the ad side I feel like I can delay the hit just a bit with my racket arm.