This is going to depend on what and how you are looking to secure your home. Some people want to handle it themselves while some people want a service to handle everything.
Some other things you might consider are a lot of the newer DIY systems on the market are cloud based so if you have internet issues the system may not be suited for you. The size of the house will also be a factor. If its large and everything needs to be wired you will have a lot a labor if you hire a service. Are cameras a part of your expected solution?
Once you have an idea of what you are looking for its much easier for the group to provide a recommendation.