scalloped or not scalloped, you will be able to reach the upper registers the same. *there is no difference, like in the jems with the upper last few frets scalloped. *what will enable you to reach up higher and grab those notes is the type of neck joint used. *like on newer jems and the RG series (470 and 570 for example.) *this all-access neck joint enables you to reach up higher. *
a true scalloped neck where all the frets are scalloped, like on the yjm fender strat, actually makes it a little more difficult to play. *you can dig into the notes more but it is more difficult. *it's a feel thing. *go with what you like.