Darlene, I cannot comment on the wildly popular DSE901 as I have only used 801/penstyle
devices. When making my final decision on what to buy initially, I went with penstyle for the larger cartridge and reported better battery life.
Now that I rarely use carts or
batteries, this has become a non-issue. I seem to get the feeling, though, that many of the modded
devices we see on this fourm ravitate toward the 901 atomizers. I am not sure if these atomizers are more durable when used with manual switches or high-voltage battery packs, or if they are just a more popular sytle.