Here is my opinion
Personally go holley 4 barrel, I drive my car on the street, and I can hardly wait to change out my dellorto. It is jetted so rich for the turbo, it creates problems elsewhere...like high cruising egt, unless you change the jetting for street driving, and track use. You can have the 4 barrell secondary come on only when on boost, so you can jet the front barrels for street driving. Inlet needle and seat is larger on a holley, no worry of running a bowl dry, you don't need to boost referance a regulator, just run it straight off a 7psi fuel pump. A 4 barrel is harder to get under a decklid, need bigger standoffs. If my car was strictly race car, which it kind of looks that way but isn't, I would keep my dellorto on with the 38mm vents. I want better drivability than what it is right now.
I am either going holley 600, or FI for next year.
Kevin