its not more adjustment its more ease of use
the program box you have to click through each option where the ota lets you hop around
i like using the OTA alot for copying profiles from one esc to another and making small adjustments while i can see all the options and not have to think ok what one is next or what was previous
i just think that using my phone to modify parameters is exponentially easier then the box.

however, if youre a set it and forget it type of person the box is probably fine.
i like to change drive frequencies, softening values etc often based on track conditions