Hardwired smoke alarms are generally considered more reliable and safer than battery-powered alarms, although they may cost more to install. They provide continuous power from your home’s electrical system and are less prone to battery failure, although they should still have a backup battery. Hardwired systems also allow for interconnected alarms, which means if one alarm detects smoke, all the alarms in the system will sound.
Here’s a more detailed explanation from anka security:

Advantages of Hardwired Smoke Alarms:

Reliability:

Hardwired alarms are less prone to failure due to dead batteries because they are powered by your home’s electrical system.

Interconnectivity:

Hardwired systems allow for interconnected alarms. When one alarm detects smoke, all connected alarms will sound, alerting everyone in the home, no matter where the fire is.

Continuous Power:

Hardwired alarms have a backup battery, but they rely primarily on your home’s electricity, providing a more stable power source than battery-powered alarms.

Disadvantages of Hardwired Smoke Alarms:

Installation:

Installing a hardwired alarm can be more complicated and may require professional installation, which can increase the upfront cost.

Cost:

Hardwired systems typically have a higher initial cost than battery-powered alarms.

Power outages:

While they have battery backup, hardwired systems are still susceptible to power outages, although the backup battery provides some protection.

Battery-powered smoke alarms (for comparison):

Ease of installation:

Battery-powered alarms are easy to install and can be placed anywhere without needing to be near wires.

Cost:

They are generally more affordable than hardwired alarms.

Maintenance:

Battery-powered alarms require regular battery replacement, which can be a hassle.

Reliability:

Battery life can be inconsistent and they are more likely to fail due to dead or dying batteries.

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