You haven't asked the right questions --- here are some answers worth considering ---
1. All of the hardware is more or less fungible, most alarm companies use the same devices.
2. Wireless devices use radio signals to communicate with the control panel, and don't require sometimes damaging or unsightly installations of wiring, but do require maintenance of batteries.
3. Most alarm systems rely on very vulnerable phone lines to communicate with the monitoring "central station" --- if your phone lines are, as most are, externally exposed and easily cut, your alarm is useless. A cell phone connection is a necessity.
4. Any alarm system is no better than the personnel operating it, most of whom would make the TSA proud, and earn false positives on IQ tests. Your only quality check is whether or not the monitoring firm and its "central station" are certified by Underwriters Laboratories (UL), which demands strict standards for certification, insurance essentials for high-value burglary risks such as banks, jewelers, gun shops, &tc.
5. Arrange code or passwords for yourself and trusted friends to defeat your own defenses, and to permit official entry by cops, EMTs, etc.
6. Protect every possible point of entry, and, add, various internal zone sensors --- motion detectors of various sorts, pressure mats, etc., enough allowing alert of intrusion while you're fast asleep...