[MostAwesomeDude]

I'm not Armin, but I've used both extensively, and the main thing I can feel is that Bottle lacks the elegant power of Flask's underlying libraries. Django suffers from this, too, but in Bottle it's even more obvious: Werkzeug and Jinja2 are deliriously powerful libraries! I remember Armin once talking about how instructional and useful it could be to derive a custom Flask from Werkzeug, and watching his methodology, it became quite apparent that Werkzeug's the best way to do WSGI at the low level. Jinja2's in a similar position; if you've ever read through Django's templating library, you'd agree.