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In the context of structural integrity and compliance with building codes, the correct approach in this scenario is to drill holes as far from the bearing wall as possible. This method helps to maintain the strength and load-bearing capability of the joists, which is particularly important when routing plumbing through structural members.

Notching the top or bottom chord of the I-joist can compromise its load-carrying capacity, leading to potential structural issues. Depending on the size and location of the notch, it could create points of weakness and significantly reduce the overall integrity of the joist.

Drilling holes allows for the passage of plumbing without altering the cross-section of the joists in a way that would weaken them. When positioned away from the bearing wall, the holes minimize the risk of cutting into areas that are critical for load distribution, thereby ensuring that the joists can support the loads they are designed to carry.

In summary, drilling holes in I-joists is preferred, particularly when done in a manner that preserves the structural integrity of the joists by avoiding critical areas close to bearing walls.