I think Pocket is better, by the style, fluency, and because it transforms websites to text better than Ip. But, one of the best features of Instapaper (which doesn't have Pocket) is that you can change the title names. I really like that feature.

Definitely Instapaper. I like the design better, pagination mode in the Pocket iOS app ist just plain buggy, and I already used Instapaper back before Pocket (formerly ReadItLater) even existed..

Instapaper has a dark-themed web version which I like and use a lot. Also Instapaper Premium, which I happily paid for a while, is now available for free for all Instapaper users, which should be consider an advantage.

However, I'm using Instapaper for a long while which is the primary reason keep using it.

For me it's Pocket because it's built into my Kobo.

I use Bookmark OS. Though not strictly a read it later bookmark manager, I find it easier to organize things

Instapaper has highlighting, which I can later export to Evernote etc

I just use Evernote.