Depends on what you want to do.
The Precision and the Thinkpads are pretty close. Both are well built, high powered mobile workstations and are quite powerful.
The Apple is a different animal. It is thinner but also significantly worse performance wise.
If you do intensive graphics or 3D work, game heavily, or overall need a very powerful computer, choose either of the first two. They're also well built, with magnesium alloy chassis, and will definitely last you a while.
The Macbook is lighter and more portable, and overall is a sleeker machine, but also weaker.
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