Alarm systems can be good or bad. Many man hours are wasted by the police chasing "false alarms." In fact, many police departments are trying to figure out ways to reduce these false calls, or charge the home owner for them. So, if you go with an alarm system,,, get a good one that has a good record of very few, if any, false alarms.
Where I live,, response time by the LEO's is at least 20-30 minutes. I'm on the edge of one county, with a nearby town less than 5 minutes away,,, but a different jurisdiction. No help from them,,, even though we are good friends with the cops there.
I suffered a B&E a few years ago. The thug kicked in my back door. Estimated number of kicks, 6-8 before the door frame broke.
I had game cameras set up around here. Unfortunately, the one camera that would get license tag info was broken. I got pics of the thug, and yet, we still haven't caught him. Even with a LOT of excellent help. He was in & out for a total time of 19 minutes here.
We have since beefed up the external defenses to prevent as much of this repeat type of B&E again. Try kicking the door, & he'll likely break a leg or foot first. Dual key deadbolts, set in a solid steel type frame will prevent the use of any door if entry is gained. Safes in the home kept me from losing the gun collection, but Miss Penny lost a lot of jewelry. We have replaced her box with a safe.
But, alarms around here are not worth much, and according to the local LEO's, less than 1% are actual B&E's.
BTW; my BIL sells & installs alarm systems that are top end & commercial. He backs up my thoughts. He also gave me an electronic gate system. Can't drive up my driveway anymore due to fencing & a gate.