Advantages of JVC from Sony (my criteria!):
1) use much better designed. Better access to folders and individual title via USB. Prima, the large-scale tapping for tracks back and forth.
2) sound really great, much better than the Sony. As the reviews when Sony can write good sound is a mystery to me. Possibly was my Sony broken.
3) access to Bluetooth is better. Everything can be controlled only through the JVC. The Sony you have to manually start the awkward player in the smartphone. Who thinks something from ...?
4) The JVC will not even SD cards via adapter, the Sony.
Disadvantages, where the Sony is better:
1) Display, resolution, brilliance are the Sony better
2) Sony supports MP4 (crash stop only permanently from ...)
3) Sony has 2 times USB port, at JVC only once
One point deduction for the 3 cons. The JVC is significantly better than the Sony 601BT in sum for me.