Personally I use readability. I like it better because my two main sources of news on the go is reeder and twitter. If I can't read an article in those apps at that moment a quick tap or swipe I can send it to reability. Which brings me to readability itself I just love the simplicity of this app!!! And also if you're using safari the readability plug in will let u send an article to your readability account or my kindle
I actually use a combination of Instapaper and Evernote. Sending to Evernote is added to a lot of apps now and makes it easier to read later and keep organized. Now with Clearly from Evernote that works as a plugin to chrome it is even better.