What do you like most? Jazz or Classic?

Classical - Jascha Heifetz specifically.  Every piece he played he made it his own.

Interesting question, curious as to what prompted it? 

Violin has been arguably the most prominently feature instrument in classical for hundreds of years, often getting the main melody in orchestral pieces and starring in quartets and other small pieces. OTOH, jazz violin is pretty rare. Of course Stefan Grappelli and a few others are amazing talents, but the repertoire is limited, inclusion in top jazz bands is few & far between. In fact I would argue that if you listed the top 100 most important jazz musicians none would be violinists. Grappelli and Ponty might be the only two in the conversation.   Cheers,
Spencer

I would have to say classical, I listen mostly to jazz but not really that into jazz violin. I like Stephane Grapelli well enough but don't find I listen to his music very often.

For myself, it's not the instrument the music is played on, but the music itself. There is no such instrument as a Classical violin, or a Jazz one. The difference is in the music itself, so whichever music one prefers is the determining factor. Classical is mostly formal, "written" music (a Classical violinist plays the notes the composer wrote, not those of the violinists' choosing), Jazz is to a large degree improvised (the violinist plays notes of his own choosing, based on the chord structure of the song). Very different musics.