Hack the box is quite competitive, you get points and for many it is a race to the top. Writeups are only allowed for retired boxes.

A very CTF heavy platform.

Not as competitive as HTB but there are points to be had. Writeups are available for many boxes and it is a bit more step-by-step hand holding than HTB

A very very decent mix between CTF and realism.

Not at all competitive in any way. Some writeups are available.

Focuses on realism.