No one I know is close to using Moto360 in heavy use for a whole day. Must be living in some alternate dimension, or has a very special view of what heavy use means.
The small apple watch main body has around 10.4 mm plus 2mm for a 30mm dimeter protusion. The Moto360 has 46mm diameter and 11.5 m thick.
The Moto360 would need to be 8.3mm thick to have the same volume as the smallest Apple watch. So, the smallest watch is 39% smaller. The bigger one is much closer in volume to the Moto360 but still slightly smaller.
I'm guessing the bigger watch will have a battery life last longer than the smaller one. If the small one lasts all day, then that would mean the bigger one would last 20-30% longer; which would be very good.
I'm pretty sure that if you want the watch face to always show, the Apple watch will oblige and yes, you will have to live with the reduced battery time,. The Amoled screen and a dark background will help though.
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You do realize that he's talking about heavy use... If your not using heavily during all that time, you'll get your two days. Right now I can kill an Ipad air in 4-6h playing a first person shooter, yet most times I won't need to be recharged every day; only every 2-3 days. Why? Because that's not a typical use, and we all know that if it is used that way the battery will not last the day.
Use and efficiency of the tablet is what deterimines the ultimate limit of how long your device will last.