Hello Folk I do not play either instrument or style, but I just thought I would add that, as far as I know, there is a difference in the way the instruments are set up. The set up of a fiddle tends to have a more flat radius on the fingerboard and bridge. This allows for more easy double string playing, and less motion in the bowing arm to reach from treble to bass strings. In addition the string choice may be different in trying to attain a different tone.

This is what I have gathered from another luthier (who work with bowed instruments). Hopefully someone who plays will confirm or refute this assessment.

As for which is the best route to follow, The more you know the better. Also I find it amazing how our musical destinations change the more we learn and the more we are exposed to. So, I say encourage every musical interest your son has, and keep an eye on the big picture. Who knows where he'll wind up. Maybe he will revolutionize bluegrass fiddle, or play oboe in a malasian symphony, or be a regular Joe with a pasion for music. Who knows... Good luck JK