It’s really up to personal preference but I’m a big fan of the metal unibody of Mac laptops. While my friends’ PC laptops plastic bodies were starting to separate and show wear, my laptop was still looking mint. That alone also helped determine how long I kept a Mac laptop going (I was on a 2017 MBP 13” up to just recently and the body is still near mint).
So while it could be perceived as a simple cosmetic preference, it was also about the longevity of the laptop’s use.
That said, I have an ASUS ROG Zephyrus that has a pretty solid body, despite being plastic. Some of them have gotten better, but a lot are still flimsy crap.
It’s the same reason I prefer the body of my iPhone, vs the multitude of plastic Android flagship phones I churned through back in the day. The G1 still holds a place in my heart though and had a metal body (and I still have it in its original box!)