The best circuit board for you, whether built entirely and manually by hand or from prints, will or should always be the custom make. For large scale heavy industry businesses, it is quite possible that, custom or not, and more than likely there will be a preference for custom anyhow, there will be a mass rollout of printed circuit boards. The custom begins long before the actual circuit board is put together.
Long before the actual circuit board is fully prepared and completed, a variety of other required or related components still need to be fashioned. These could be custom built wire harnesses or impeccably designed PCBs. In order to prepare a custom design successfully, the design team needs to work closely with the client. It should not matter whether the client has a sound knowledge of electronic workings or not, the design team should always be well positioned from experience and technical knowhow to know just what the client is getting at.
Knowledgeable or not, the client should be standing by at the moment when parts are being selected to go towards the composition of the circuit board. Once a circuit board has been built, the work is not finished. The board still needs to be tested to make sure that all parts and components are working as they should. Should it happen that any issues have developed along the way, these can be addressed on the spot.
Technical engineers are appointed to address issues that may have developed and the subsequent correction of errors, should these have occurred. And yet still, the work is not finished. Now the developer and his client can be ready to carry out the application. And dare it be said that further testing in a live environment will be carried out.