Screen protectors: usually a low-risk yes
A thin screen protector adds minimal bulk and meaningfully reduces scratch risk from everyday knocks against doorframes, desks, and bags — a fairly easy addition either way.
Cases: depends on activity level
A protective bumper case makes more sense if you\’re active, work with your hands, or play sports regularly; for mostly desk-based daily wear, the added bulk may outweigh the benefit.
Watch out for touchscreen sensitivity
Cheaper screen protectors can slightly reduce touchscreen responsiveness — worth testing before committing, particularly for watches that rely heavily on touch gestures.
The honest middle ground
A screen protector alone covers most everyday risk for most people; a full case is worth adding only if your specific routine genuinely involves regular knocks or impacts.
Check compatibility before buying either
Screen protectors and cases are typically sized to a specific watch model and case size, not universal — confirm the exact fit before purchase rather than assuming a generic option works.