First of all, the most obvious point is that the custom loop has more freedom than the conventional loop, that is, it is more flexible (refer to the help information of specific modules), and many loop controls have many additional conditions that can only be completed in the custom loop;

In addition, from the point of view of central control system design, customized loop seems to have inherent advantages. I have seen such an introduction that "adding and subtracting custom circuits will not change other circuit information, and adding and subtracting conventional circuits will be downloaded offline as much as possible" (some information of Central Control is only known by insiders. Many settings are default, and I don't know why).

To sum up, I suggest you make the control loop into a custom control scheme.

PS。 I am not an expert, but I am willing to discuss with you. The above suggestions are for reference only. In addition, it seems that you are interested in the SCX language version 2.5, so I suggest you refer to the PDF software manual version 2.5, which has a more detailed overview.