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Seems they both let you retrieve the minimum, which is what I need for Prim’s algorithm, and force me to remove and reinsert a key to update its value. Is there any advantage of using one over the other, not just for this example, but generally speaking?
Generally speaking, it is less work to track only the minimum element, using a heap.
A tree is more organized, and it requires more computation to maintain that organization. But if you need to access any key, and not just the minimum, a heap will not suffice, and the extra overhead of the tree is justified.