Rhino offers no extras when you compose a post. Adian, Appeio, and Netbot all allow you to attach photos to posts. Adian, Netbot, and Felix also add the ability to save unfinished posts as drafts to revisit later.

It's almost not even a fair fight. While many App.net clients are still struggling to perfect core functionality, Netbot is well beyond that phase of development; instead, the app offers a slew of advanced, clever, and helpful options for reading and enjoying App.net.

Felix is probably the best of the rest, thanks to its understated elegance. But none of the other apps I tried can compare favorably to Netbot. Its lead isn't necessarily insurmountable, but there's an awful lot of work ahead for the upstarts looking to unseat it.