It is not so difficult to purchase a production home. The whole process of purchasing a production is very simple and streamlined so that you do not have to put too much effort into it. All you have to do is to identify a good community/society for your home and a builder who can do a decent job. Then you simply need to choose a model of the home that you like and wait for the project to be completed. Of course, you might have to visit the site occasionally. But, apart from that, there is not much effort on your part.
On the other hand, you have to involve yourself a lot more when it comes to a custom home project. Of course, you still have to find a good locality and a good custom home builder. But, your job is not yet done. You have to carefully monitor the whole project at every step. A custom home construction project is like your own baby. You have to be fully responsible about it.