If Apple made a watch with 1/4 the battery life of a Pebble, I would agree. However, there are apparently 20,000 people who prefer to have less functionality and more battery life than Apple/Samsung/Google are interested in offering.
There are other options like Garmin and Amazfit, but honestly the UI on both of those are pretty awful, especially compared to the slick Pebble UI.
...and BUTTONS! Pebble's capabilities are excellent b/c the UX of a ~1.5" screen is wildly different than that of an iPhone. Up/Down/Forward/Backwards and the occasional long-press is an excellent match for on-the-go interaction.
I absolutely hated brushing the iWatch screen and triggering random crap and there was no other way to interact with it! Garmin's w/ 5 buttons and transflective (sunlight-readable) displays have been the closest alternative, and they have a pretty cool "touch-screen alt mode" which you can access via press+hold on two of the diagonal buttons to enable/disable (or automatically starts if you open up the "maps" app for dragging it around).
Long battery, sunlight readable, buttons.