Pre-built mindmaps give speed and structure. Building your own often gives deeper ownership.
But in practice, the choice is not only between using a pre-built map as-is and rebuilding everything from zero. There is a very useful middle ground: import or start from the pre-built map, then edit it until it feels like yours.
That middle ground is often the strongest option. You save time because you are not starting from a blank canvas, but you still gain ownership because you are adjusting the branches, labels, and transitions according to how you actually understand the surah.
So the better question is not "pre-built or custom?" It is "how much structure do I already have, and how much of it do I still need to personalize?" The important thing is not which option looks more advanced. The important thing is whether the map becomes real in your memory.