Phones are thermally challenged, they can run fast for a short time but not sustained the heat builds up, so they're bad for vast types of tasks like media processing large complex documents.
A laptop with a fan is next level up.
A Tower PC is next level up and even then some need to run liquid cooling through them if they overclock.
The electronics in phones are different. You're often talking for the same level of performance, a phone is more expensive. The same $ spent on a laptop can be faster as it doesn't have to shrink everything with such attention to expensive details.