I don't know the difference between the 901 and 901b, but the penstyle is larger, has a longer battery life and the cartridges hold more so they will last longer than a 901 cartridge.
901b is usually black (hence the b). The pen style is designed around a fancy Chinese cigarette holder with a cigarette in it. It is therefore much bigger with larger carts and good battery life. As an ex-pipe smoker I find it delivers pipe-like clouds of vapour when new. Sadly my experience of penstyle atomisers is that they die fairly quickly - but I will be pleased to be proven wrong! I do know that they work better with a USB pass-through battery imho.
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