We made some in-depth comparisons between these two iPhones and the results were disappointing. Despite Apple's claim that the iPhone 6s Plus supports optical video stabilization—the "old" iPhone 6 (digital stabilization only) brought better results in extreme situations! The differences are subtle but remarkable. We checked the files on large screens (modern tv sets via Apple TV 4). The iPhone 6s Plus, however, shows stabilization while recording (in the viewfinder screen), that seems to be the only advantage; the footage itself is worse. That's reason enough to send my iPhone 6s Plus back because I hoped the stabilization would be BETTER than worse. I'll phone up Apple on this topic next week (maybe it's a software problem and there is an update pending) but I'm pretty sure that I didn't get a faulty iPhone 6s Plus so… I made around 1,700 video clips in the last year with iPhone 6 and they are pretty good. I can't recommend the iPhone 6s Plus for being better at 1080p60 videos.