Is there a difference. The specs seem almost identical. I know the Pico has a screw in battery placement while the Aster is magnetic. Which is the preferred solution? Which is more durable? I want a TC capable mod with a single 18650 battery, that takes a 22mm 510 thread tank (Subtank Mini). I will use mostly in power output wattage mode. Any otherbetter solutions in a price under $30 US or under $40 CDN?