In CG or any of those variations, where she's upstairs, I prefer a stroke as I and lil Badger* get better stimulation.
Both pleasure and blood flow to keep me in the game^^!
My thoughts on the grind are, and it also looks like it too, the Kgirl is getting herself off and I let her do her thing!
A gent should let the lady enjoy herself, she is happy and relaxed, and then she is back to helping you finish up, right?
I get that quite a bit.
Then there are times I start to lose it and get her to go back to a slow stroke so I can keep up the good work^^!
Another look at the grind, that I've read, is the Kgirl is in a resting/build up her stamina again mode.

Feels better to me. Unless the girls canal is very tight I just don't get the same sensation from grinding.

Grinding is great. I just love being all the way inside up to the hilt. There's a lot to explore while all the way in, and not everyone makes it all the way there

But she will not get me to climax with a grind. I think of more as a breather period for me that is both very pleasant, for the reason you say, and prolongs the activity.

A million years ago, multiorgasmic tube sock-wearing Planet Claire (damn I miss her) would get so worked up early in our sessions that she would stop and and say "I really want to come right now!"
She would aggressively flip me onto my stomach and put a small pillow under my hips to lift my ass.
Then she would lay in top of me and grind her clit on the tip of my tailbone. She would find the right position and then just go nuts, flailing around and I could feel her getting wetter and wetter until she convulsed and collapse on top of me. It got me so hard because she was just getting warmed up, and I was anticipating what would follow.
After catching her breath and recovering, she would turn me over and say "ok now your turn!" and she would attack me, kissing and sucking every inch of each other's bodies and laughing as we would have another fantastic memorable session.

the Grind also gives her a breather too?

Of a sort no doubt. Uses a different set of muscles. I think some just like it more though.