Cookoo gets closest, in my opinion. A classic, round look. An analogue movement. Very, very simple notifications, no touchscreen or other bollocks.
I do not need my watch to be a crappy monochrome version of what I could see if I just pulled my phone out.
I want it to look like a watch, last for many, many months on a single battery without recharging, and give me simple notifications, so I don't have to check my phone in a busy/noisy place for a new email or text.
However, although Cookoo looks good, reviews (both professional and consumer) show it disconnects near-constantly, and of course it doesn't support Android. I do understand why - Google has been terribly slow at getting Bluetooth 4 LE into the stock stack.
So, that is to say, I fundamentally disagree with the title of this piece, I don't want my watch to run "apps" at all. I never want to get in a situation where I'm charging two devices every day, that would just make my life that tiny bit less convenient.
Of course, some may genuinely want a shite version of what they could have seen in 5 seconds by pulling their phone out, and to charge two devices constantly, but I'm not in that group.