I have a "heavy" linen sport jacket w/ the neapolitan shoulder, looks great, but it was cut by a neapolitan tailor. I even have it on HEAVY tweed sport jackets, it actually works fine because a built up shoulder with fabric that thick will look more roped than it really is.
Depends on what you like and how well their particular tailor can execute either style. I think the neapolitan thing should be left to those who were taught to cut and sew it that way. Just out of curiosity how does the fitting process work, I assume this isn't traditional bespoke.