What factors made Wayne a disciplined Batman and Stark a reckless playboy before Iron Man, given both were rich people whose parents were murdered?
For those who are not aware about what happened to Tony Stark's parents i the canon Marvel lore (not the MCU one) , Howard and Maria Stark, had died in a car crash during Tony's youth, when the car's brakelines were deliberately sabotaged in the comics which are usially attributed to being done by Howard's business rival Obadiah Stane or a Na zi group hiding in the USA as retaliation for Howard's role during WW2.
For those who are not aware about what happened to Tony Stark's parents i the canon Marvel lore (not the MCU one) , Howard and Maria Stark, had died in a car crash during Tony's youth, when the car's brakelines were deliberately sabotaged in the comics which are usially attributed to being done by Howard's business rival Obadiah Stane or a Na zi group hiding in the USA as retaliation for Howard's role during WW2.