I do this everytime, because I am developing a strain. I have a few criteria: 1) if the seed was very old and took 2 weeks to germinate, I grow it, I figure this will be helpful for future generations. Hopefully making the strain hardier from germ. 2) I rejuvenate, the smallest plant with the biggest buds, and the plants with the biggest buds, and all early girls(auto flower), especially if they autoflower on 24 hours of light, which I have never seen until weeks ago. Not that I have a whole lot of experience, but I have a lot of friends. 3) Any plant that gets thrashed early on in infancy and actually continues to grow, example: a seedling gets flattened cause I am not paying attention, and instead of shriveling up and dieing it seems frozen with the starter leaves but stays green, then starts growing again. After flowering if they are stoney I will rejuvenate and reflower to pollinate.
PS- OH yes and the stoniest plant always is rejuvenated aswell.