Depends on the kid’s hobby and purpose of the computer. I’ve always known that MacBooks are better for music making (especially driver hassle, audio signal reliability, etc.). Could I afford a MacBook as my first laptop? No. Did I buy a second-hand MacBook as soon as I could afford it, and have been happy with it since? Yes. As a teenager, I would’ve loved to buy a new MacBook for 500/600€.

I’m sure most other applications are less Mac-optimized, though (software development, 3d/graphics editing, gaming, …).