The Loop magazine articles aren’t pitched but, rather, authors are invited to contribute. Additionally, articles are exclusive to The Loop magazine whereas with The Magazine, authors can republish them after a certain amount of time.
Issue 1 has some great articles and if you’re a fan of The Loop then it’s well worth the $1.99 monthly subscription.
I’ve tried to use Newsstand in the past, having subscriptions with magazines such as Wired, but just didn’t enjoy the experience. I think the key to Newsstand is definitely apps such as these, focusing just on the content with a minimal amount of imagery.