Now that my 401 has gotten here today, I'll answer my own post!
The 401 has got a TH that I would never have thought would come from such a small device. It's the same diameter as an analog, just longer. The flavor isn't bad, but I'm using some new juice so I can't really give a good review for that. It does seem like the 901 has better flavor I have to say. The 401, imo, has a little harder draw and while it dosen't put out as much or as dense of vapor as the 901, again, it does well for it's size. I like both of them, it's one of those things where you use one for one thing, reason, craving, whatever, and one for another. I was impressed with how long the carts last for the size of them, but I am dripping a couple drops when I top off too, which I don't normally do on any of my other e cigs. All in all, they are comparable, I think. It just depends on what you are wanting. Of course, since I just got it today, it's still getting broke in. Hope I helped somebody! Thanks for the help from everyone else!