Which aftermarket alarms

Looking for a good alarm. Which ones are y'all using?
Someone hit my work truck ( not Tacoma ) while parking or pulling out on passenger side and didn't see it til I got home.
Usually make a habit of doing a walk around because a lot of drivers suck ass.
So, what are y'all using ?

Another search will be a good install shop because a LOT...A LOT of them suck ass at it too.

 

I have heard a lot of alarms go off for various reasons in public places, but I've never seen anyone take any action about it. Unless it's the owner in a twit because they hit the wrong button.

I've also ripped a few alarms out of vehicles because of starting/running issues that they induced, usually after a few years.

So, yea, I'm not a alarm fan. Don't see much value.

However, front and rear facing cameras, ones triggered by motion and such, seem like they might be helpful. Both when parked and on the move. Maybe look into those along the way?