Been reading through the threads since this morning and honestly the scanner tech on the S26 is way more sensitive to air gaps than older models. If you're dead set on glass but worried about the scanner failing, you basically need to look at how the adhesive is applied. The AmFilm OneTouch Tempered Glass Screen Protector for S26 Ultra is a solid middle ground because the installation frame keeps things precise, but some still find it hit or miss compared to film. If you want the best possible recognition rate, hybrids are usually the sweet spot. Something like the Spigen NeoFlex Solid Screen Protector for Galaxy S26 Ultra works great because it is a wet-apply film. Since it uses a liquid solution during install, it eliminates the microscopic air bubbles that usually mess with the ultrasonic sound waves. For real technical deep dives on this, check out the accessory mega-threads on XDA Developers or the Galaxy S26 subreddit. People usually post response time benchmarks there which is super helpful. Quick tip for when you get the phone: go into Display settings and toggle on Touch Sensitivity immediately. Then, delete your old prints and register your main thumb twice—once while the screen is dry and once with a tiny bit of moisture on your skin. Makes a huge difference for those stubborn glass protectors.

Tbh i've been really happy with the cheaper kits lately. You dont really need to blow a fortune on those fancy UV setups anymore. I just put on the amFilm OneTouch Tempered Glass 2-Pack for S26 Ultra and it works like a charm. No complaints at all with the scanner speed on my end. The trick is to just be a bit patient with the setup. Once the glass is on, delete your old prints and register them again. I usually register my main thumb twice at different angles just to be safe... works every time for me. Its a way more cost-effective way to get that smooth feel without the headache. Ngl, the alignment tool that comes in the box makes it so easy you can basically do it with your eyes closed. You should be totally fine with that choice for your new device.

Honestly glass is getting worse every year with these sensors. I spent a fortune on glass for my last few Ultras and its always a struggle. Even if people say it works fine, you usually have to press way harder or re-register your prints five times. Its pretty disappointing how finicky the tech still is. If you are dead set on glass, here is my take:

• Whitestone Dome Glass UV Liquid Adhesive Screen Protector is basically the only one that stays reliable because the liquid fills the gaps, but the install is a total mess.
• amFilm OneTouch Tempered Glass Screen Protector is way easier to install but i still had issues with it failing to read my thumb half the time.
• Honestly the Samsung Official Anti-Reflecting Screen Protector film is the only thing that works 100% of the time, even if it doesnt feel as nice. I really wish they would just figure out a better sensor placement.