I have here two iPhone 6s's, 128GB, Space Gray, one is TSMC and the other Samsung. I've restored them each from the same backup, removed the SIM from each, placed them in Airplane mode, set screen brightness to max, killed all background apps, charged to 100%, and otherwise made them as identical as I know how. I ran GeekBench 3, and, just as other tests showed, after a time Samsung's battery fell to 48% while the TSMC's battery was at 54% (6% delta). BUT THEN, I stopped GeekBench 3 and instead ran about 2 hours of slideshow from the camera roll (the two phones stayed exactly synced on the same photos), and then played a movie (again, the moves stayed exactly synced). After both the slideshow and movie run-downs, Samsung was at 21% and the TSMC at 27%. DELTA STILL AT 6%. I think there's something going on in GeekBench 3 that is not "real world." Perhaps the heavy usage during the GeekBench test causes a heating effect or other phenomena that results in higher power consumption, but this is something that few people would see in everyday use. Based on my testing, I would say the TSMC and Samsung behave near identical in real-world usage. In fact, there may be other qualities about the Samsung that aren't easily put to a benchmark test that may show it to outlast the TSMC in lighter-than-normal use. I'm going to repeat this testing at least two more times, and I'll post additional info if something comes up. In the meantime, please relax and know that whether you have TSMC or Samsung, you're holding one of the finest pieces of technology in the world. Be happy it's in your hands.