Hi
I have both,
IMHO -
I prefer the 801
the carts last longer before needing refilling, or changing.
I use USB so battery is no problem for me,
but when I was on batteries, the 801 lasts a lot longer,
3 - 4 times longer.
The taste, flavour is a little milder with the 801,
the 901 does seem to taste stronger, and lots of members say that.
I think maybe the 901 atomizer burns a bit hotter ??
but I just put a bit more flavour in the 801,
and - no probs.
I would reccomend a newbie to start with a--
801 usb smoker, an atomizer and 5 cartridges,
very cheap set up, and you will get a good idea
of if you like it or not.
Then go from there and buy more if you want to.
Di ......