While a wireless alarm system is convenient and cool, the stability of that kind of network will completely depend upon the wireless signal coming from the router. Unless you have a very reliable network with a very solid (and probably expensive) security camera to go with it, you could be at the mercy of dropped signals. Inconsistent signals from your network can cause false alarms from your security system causing minor inconveniences like waking you in the middle of the night. While the same network problems could allow real security issues to go undetected. Even though wireless security systems are readily available and their technology is advancing regularly, they are definitely not worry free. They also require more maintenance than their wired counterparts.
On the other hand, wired security alarm systems have been on the market for a very long time and have a proven track record of reliability. Manufacturers from all over the world have improved the technology to near perfection, and it’s now more available and cost-effective than ever before. Their main downfall is that they are reliant on power to work, so power outages can be an issue, unless backup batteries have been installed. Wired security alarm systems are much less expensive than their wireless counterparts. You can install a complete wired security system for what you’d pay for just a few basic wireless sensors.