The advantage of customs is you can pull from several of the tags the origins have one of the tags + their own quests essentially whereas a custom character gets to choose 2 of the tags.
The Origin characters have 2 tags and these tags more often go together for solution sets than the others.
There is no advantage to the Customs in the tag department.
In fact Origin characters also get their Origin tag. Custom characters do not get access to it. Which is also quite often the solution to problems, open up new quests, and new opportunities that ordinary tags do not.
