I'm not sure you know what a choice is. I'm not sure you get the point of the scene period.
I mean...
His arc isn't as cohesive as it sets out to be and it gets muddled along the way but ultimately it's about choosing the family he found in Yondu and the Guardians over himself, Ego and his birthright as a celestial.
Peter finds out he's the same as Ego by birth but chooses his newfound family over him.
You mean Peter realizing what path this leads down to makes him choose differently? Who would have thought.
You're the one who brought up the whole choice thing and keeps bringing it up. You're saying that he chose his found family once he saw where everything led, and I'm saying that he actively had that choice taken away from him with the revelation that Ego killed his mother. To say that there was any sort of choice between the Guardians and continuing on with Ego after that point is completely antithetical to the already established character.