It larger as it in has a larger screen which draws much more power. Not sure where you are going with this. There are AW watches that are smaller and last all day also, and then some. LG G watch, Zenwatch, Gear, etc.
A bigger battery generally more than offsets a bigger display (see the iPhone 6+ getting better battery life than the iPhone 6 even with a larger display). All of the watches you list are still larger than the largest Apple Watch.