Already own the 2XL - the 2XL and 3XL will probably be the only fan/flat shaped brushes I'll ever own, since I prefer the look and feel of bulbs.
I also considered the Stubby 2 NON XL and Stubby 3 NON XL - but have only heard that they are not nearly the same density, thus the feel will be different. They will still most likely be great brushes, just NOT Stubby XL great, if you know what I mean
Yep the two band not "extra sized" Stubbys are less dense than the "XL" line, they also have a higher loft, so they have a much different face feel. The "XL"'s are much more scrubby to use. The handles on the "XL"s are also a bit smaller. I had both a 2 and still have an XXL and although both are luxurious, the XXL is tuned as a dedicated face lather brush, where the size 2 was a middle of the road brush.
As nice as it is, I prefer bigger brushes. I dont actually use mine that much anymore, but its still one heck of a nice brush. One of these days I'll probably wind up letting it go. Really when I reach for a badger, I'v been using my two 32+mm M&F's almost exclusively. SBAD marches on...