Motion Security Alarm Are Small House Alarm Security Companies Just As Good As The Large Ones?

Are small house alarm security companies just as good as the large ones? - motion security alarm

We are entering into a new house and offer to be called in a security system. I know it will not be cheap, because we are about 6 doors, 6 windows, and, probably, 2 motion detectors have for the house. My question is whether big companies stick better as Brinks or ADT, or smaller local companies, so good, better or worse?
What is your opinion?