I'm not sure where they're getting the idea that apps on Android Wear watches are simple and Apple Watch apps are more advanced. They're both simple if you compare them to smartphone apps. And um not even sure how they can say that as the Apple Watch isn't even out yet.
It's just that Android Wear focuses on time, notifications and Google Now, apps are there but not front and center.
The Apple Watch is about Time and apps, notifications are secondary and they have nothing like Google Now.
They have a different philosophy on how a watch should work, Google thinks it should augment the phone by giving you a portal into the phones notifications and Google Now cards. Based on Google's design they feel if your going to look at photos, make a phone call, browse maps, read social feeds and play games you should pull out your faster phone with its bigger screen to do so.
Apple is trying to replicate what worked on the iPhone and iPad on the watch and focus on, for better or worse, apps. And there are some situations where this make sense. I guess well see as Google and Apple iterate their watch software to see which one people want. My guess is they end up meeting in the middle.
As for the differences, the Apple Watch lets you make calls (but please don't) and you can send little hand drawn messages and drawings, and your heart beat. That's exclusive to the platform, but I just can't see myself using it. Feels gimmicky. But I'm sure it will be popular with kids.
Android Wear supports GPS and you can put music on your watch and connect Bluetooth headphones to it. So those who like to run or bike or anything athletic can leave the phone at home and still have your music and all your fitness tracking done. As of right now these features are not found in the Apple Watch. But are again likely not something I'd utilize, but definitely good for the athletic type.
But in the end it doesn't matter, they're not competing with one another. If you have an iPhone you can chose between an Apple Watch and a Pebble Watch and if you have an Android you can chose between an Android Wear watch and a Pebble Watch.