Thanks for the post and I can understand how it would be hard to parse through conflicting views. Here's my take:
1) I have no preference of one over the other for general strength training, e.g. someone who is not competing in powerlifting, as they both have similar potential to increase muscular strength and size of the legs, trunk, and back- but neither has a significant advantage over the other.
2) I'd have beginners do both if they had access to them, as there's no reason to specialize on one type of exercise for a new lifter. Specialization reduces motor learning, increases risk of overuse injury, and impairs long-term development.
3) The trap bar doesn't engage anything "better" than the deadlift using a similar relatively load, e.g. 70, 80, or 90% of the 1RM for that exercise. Similarly, the regular deadlift doesn't engage anything "better" than the trap bar deadlift. They are about the same, though the specifics of each movement, e.g. the range of motion and movement pattern, will confer slightly different specific fitness adaptations. Nevertheless, we wouldn't expect any different in an nonspecific metric of performance like vertical jump height, running velocity, or split squat strength.
You might want to pick up our Beginner Template and read the programming section in there and, additionally, listen to our programming podcasts. We cover a lot of this stuff in detail

-Jordan
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