I'd say generally from my own experience that late timing may feel better and allows a player to get better leverage and revs BUT also causes shorter less free arm swings, more muscling the ball and lower ball speed for the most part at least for me.
I work hard on the 1/1 concept of starting the ball step right foot drop ball into swing right hand <assuming right handed> Frees up arm swing, creates less muscling and ball speed.
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Scott