In this video, I’m putting Logitech’s brand-new MX Master 4 head-to-head with the proven MX Master 3S to answer the only question that matters for 2025: which one actually deserves a permanent spot on your desk. I break it down the way I’d shop for it myself—productivity first, creative work second, and then the day-to-day stuff that either makes a mouse feel “invisible” (in a good way) or annoys you every single hour you use it. I focus on where the MX Master 4 genuinely moves the needle versus what the MX Master 3S still does better, depending on whether you’re editing, designing, coding, or just living in spreadsheets and browser tabs. The big takeaway is that this isn’t a simple “newer is always better” situation—there’s a real trade-off at the end that decides which one fits YOUR workflow. If you’re trying to pick one mouse to buy and keep for years, this comparison is meant to save you from the wrong upgrade.