Acoustic violins rely more on the type of wood, construction, and overall technique than an electric violin. Frets take away some of the freedom, but it also allows you to neglect parts of your technique, and ear development favor tactile or visual feedback. I only recommend fretted violins for those who have been playing for years and have mastered at least advanced techniques on a traditional violin. For new students, I recommend finger guides, if needed, like the Fretless Fingerguide to learn muscle memory and finger placement.