Depends on what you want. You want a plastic proprietary battery that will fail on you eventually but vapes at a decent 3.7v and has great button and battery life, or do you want a stainless steel pv that gives you the option of 3.7 or 6v, purely mechanical and user serviceable, has no wires or leds and thus can't fail, and will most likely last you the rest of your life?
When you answer that question, then the answer will probably be the Prodigy V3.
lol