What do you think? Is a Turbo DR4B worth it for super speedy fast? Or go with High Speed, less speedy fast but easier to control?
It might be a surprising answer from me (lol), but just get the datalog.
Get the HS gears on, start logging the motor power vs. quad encoder position, let the driver do a full speed run oved the field and capture the data.
Then do the same with Turbo.
From the data, you can derive (no pun intended) the speed profile and the acceleration. And most of all, how long did it take the robot to accelerate to the full, or at least equivalent speed. You can overlay the curves if you wish, both of the distance driven (raw encoder data) and of the derived speed.
Then ask yourself, in a real match, or at least in a skills run, how often would you move far enough to actually see the top-speed benefit of the turbo.