It's slightly terrifying how much better the PTS is that the G, in every possible aspect, despite technically being worse. It's got less RAM, it's got a slower processor, it's got a smaller screen, it doesn't have a touchscreen... but somehow it ends up being a vastly nicer and more useful thing than the G.
I think that partly it's to do with different expectations. The PTS feels like a watch with lots of cool features. The Wear feels like a lobotomised smartphone which would frustrate me every time I use it.
But there's a lot of really careful design in the Pebble which is missing from the G. The UI is amazingly fast --- you never have to wait for it, ever (unlike the G). It's well designed and I can find things, unlike the G with it's weird U-shaped settings menu. I control it by pressing buttons, which is fast and reliable and, critically, means that the screen's not covered by my fingers; the G was controlled by sloppy touchscreen swipes that it wasn't very good at recognising.
Also, the PTS has a 10-day battery life and a screen that I can see in direct sunlight.
(The PTS screen is a thing of beauty. It's a reflective Sharp Memory LCD, and you can see it in direct sunlight. Like, it looks really good in direct sunlight. The colours have this metallic tint to them which the UI design shows off nicely. It's small, but so, so much nicer than the G's screen.)