Thinner designs are subjective. I would like to delve in objective comparison, Samsung or Android has ways to go to catch up to unit battery life from a device. iPhone 6s Plus has a 2750mAh capacity battery while Samsung S7 edge has a 3600mAh capacity battery. For Android to be as efficient as iOS Samsung S7 edge should have had 11.85 hours of battery life from a bigger battery when compared to 6s Plus. And S7 with a larger battery than 6s Plus just cannot match the iPhone.
What this tells me is Samsung is more interested in increasing battery life by brute force (just increasing capacity) instead of innovating the hardware. I know for sure Samsung cannot innovate on the software, because that falls squarely on Google's shoulders. And looking at plain vanilla Android on the Nexus 6P which has 3450mAh battery capacity, the results are even more disappointing considering there is no overhead of bloat. Android is just not able to match iOS on OS/software optimization.
That's most likely not by choice, there is not much alternative to Android at the price point to majority of the folks who don't want flagship phones.