[lost-theory]

I used bottle for one project, but switched to Flask for everything once it was released. In my opinion the future is very bright for Flask (extensions, blueprints, community). The code and libraries it is built on top of are all extremely high quality.

[stavros]

Basically, bottle was here and things were good, and then Armin decided to announce Flask as an April Fools joke and ate poor bottle's lunch.

Bottle and Flask are similar enough, but I think Flask has more momentum and support.