I’ve been daily driving both the OnePlus 15 and the Galaxy S25 Ultra for about a year, and honestly… they’re two of the best Android phones I’ve ever used, bar none. On the surface they’re super similar: big, bright, beautiful displays, excellent thermals, great speakers, and flagship-level performance. But after long-term use, two areas really separate them for me—cameras and (especially) battery. The thing that keeps bothering me is Samsung still sticking with that traditional 5,000 mAh lithium-ion setup on the S25 Ultra. I’ve had days where I can straight up kill it, and if I make it through a heavy day I’m genuinely shocked. Meanwhile the OnePlus 15’s 7,300 mAh silicon-carbon battery is ridiculous—in a good way. I can consistently pull three days, or two full days even with heavy video recording/editing and gaming, and the charging is so fast it’s one of the first phones I’ve never had to charge overnight. Beyond battery, Samsung wins display (brighter, sharper, better color, plus that anti-reflective coating) and software (One UI + Good Lock is on another level). OnePlus wins raw feel and speed—the animations, scrolling, and that “speed beast” vibe is just different. Camera-wise I prefer Samsung overall, but both struggle in low light; OnePlus surprised me and even handles moving subjects better than Samsung in my experience.