It sort of depends on your situation. Typically, people rent a beginner instrument for a year before investing in an intermediate instrument. This intermediate instrument (your voila is this I would assume) will last you until you have to play in college or a professional setting.
So yeah, the major factors that should affect your choice:
1. Quality/ age of your current instrument
2. Quality/ cost of the new instrument
3. Performance setting the instrument will be used in
Best of luck!