First Alert SC5 Battery Smart Smoke & CO Alarm vs X-Sense WiFi Smoke & CO Detector

X-Sense WiFi Smoke & CO Detector is the more complete option versus First Alert SC5 Battery Smart Smoke & CO Alarm in 2026, helped most by price, rating, and screen. What pushes it ahead is price, rating, and screen, and built-in light keeps the advantage from looking narrow. First Alert SC5 Battery Smart Smoke & CO Alarm is still relevant if you care most about warranty, integrations, and steam check, but X-Sense WiFi Smoke & CO Detector is the stronger recommendation overall. For most setups, X-Sense WiFi Smoke & CO Detector is the smarter buy.