Who's more reckless, Scorpio Plutos or Sagittarius Plutos?

Pluto in signs affects a generation of people and does not have a personal interpretation. Pluto only has a personal meaning when it's in a house or is aspected to personal planets. So the answer to your question is neither.

Sagittarius plutos no doubt, since saggittarius people tend to live more in the moment and are fire sign. Sagittarius people are the most likely people to use the word, YOLO. Scorpio are more daring than rackless, they will take risk but will be more cautious than pluto in saggittarius. And you might want to look more in to the mars sign too since mars is all about aggression, drive and impulse.

I see Peter tooting his own horn, mhm. Little does he know that "reckless" has more of a negative connotation to it - it's actually synonymous with foolishness, impulsiveness, rashness, etc...essentially stupidity. So /that/ attribute can go /directly/ to Sagittarius Pluto individuals.