I am just wondering if Posterous has a larger ☞ iPhone community than ☞ Tumblr. Judging by the number of posts, I’d say that it looks so.
Another aspect would be the iPhone support for Tumblr vs Posterous. I heard that Posterous is into email big time and that Tumblr has submitted a new iPhone app version, which I hope to bring a lot of new features.
But at the end of the day it is about people. So, what do you think?