The MX Master 3S is the better buy for most people: quieter clicks are transformative in shared offices, and the $20 premium is small. The original 3 is only worth it on deep discount.
Score
Logitech MX Master 3S
4.7/5
★★★★★
Logitech MX Master 3
4.6/5
★★★★★
Comparison Table
Spec
Logitech MX Master 3S
Logitech MX Master 3
Price
$99
$79
Click Noise
Quiet (90% less)
Loud mechanical
Sensor DPI
8,000
4,000
Ergonomics
Same shell
Same shell
Battery Life
70 days
70 days
Scroll Wheel
MagneSpeed
MagneSpeed
Logi Flow
Yes
Yes
Pros
Logitech MX Master 3S
Pros
90% quieter clicks than the MX Master 3
8K DPI sensor (up from 4K)
Same flagship ergonomics and scroll wheel
Logi Flow works across 3 devices
Logitech MX Master 3
Pros
$20 cheaper, frequently discounted
MagneSpeed scroll wheel is unmatched
Identical ergonomic shape to 3S
USB-C charging is rare in mice
Cons
Logitech MX Master 3S
Cons
$20 more than the older model
No redesign, identical shell
Still no true Bluetooth multipoint
Logitech MX Master 3
Cons
Loud mechanical clicks
4K DPI sensor is older
Discontinued, limited stock
Who Wins?
Shared or quiet officeLogitech MX Master 3S
Strict budget under $80Logitech MX Master 3
High-DPI 4K monitor workflowLogitech MX Master 3S
Already own an MX Master 3Tie
First premium mouseLogitech MX Master 3S
FAQ
Should I upgrade from MX Master 3 to 3S?
Only if click noise bothers you or your coworkers. The shell, ergonomics, and scroll wheel are identical. If your MX Master 3 still works, keep it.
How much quieter are the 3S clicks?
Logitech measures a 90% reduction in click noise. According to published specifications and product information, the 3S clicks are designed to be significantly quieter than the original 3.
Is the 8K DPI sensor a real upgrade?
For most users, no. The 4K sensor on the original MX Master 3 is already plenty for productivity. The 8K sensor helps on ultra-high-resolution 5K and 8K displays.