I installed an app for an Android forums site. When I clicked on a link in an email I received, I was presented with this choice of how I wanted that link opened. It knew the app was installed, and it gave me a chance to visit the site with that app, or open it with my default Chrome browser. And it also let me decide whether to do that once or to have that as the default action.
I don’t believe iOS lets you do something like that.
It’s part of the open, more accessible feeling I’m getting from my Nexus tablet.
A small thing? Maybe. But it’s a nice convenience.