it seems to me that the 901 cart is better at leeching the liq to the atomizer. the pen cart will hold more liquid but sometimes isnt as good at using all the liquid that is in there. i have noticed that i dont have to top off the pen carts as often as the 901 but i still top them off pretty frequently.
For me, the penstyle carts lasts 3-4 times longer than the 901's. This is when both are new. The penstyle for me can last longer than 901 especially when both gets older...
My personal observation...Doesn't mean its true for everyone cos there are many 901 lovers here...
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