What is the correct url construction principle?

Question

RESTful API

In a situation where I need to get all the comments of the 1st post, which route would be more correct for this:
"/posts/1/comments" or "/comments?postId=1"?
And if the first option is correct, then what if, say, further, you need to display attachments in the comments?
Here it will probably be more pleasant to use not "/posts/1/comments/attachments", but "comments/id/attachments".
Which of the construction options to choose in what situations?

Answer 1

All options are correct. For the most part, the difference is that some addresses are easier to route to different microservices. Well, personal preference plays a big role.
UPD. And using get parameters in this form is considered bad manners, but mainly because it is more difficult to use the same type of addresses and "nested" resources