Royal Marines or Parachute Regiment?

Im just after a bit of insight. I recently failed my medical for the RAF Regiment but i can still be a Marine or Para. Originally i was going to go for para but a load of ex-army instructors i know told me not to go anywhere near the paras as there is a lot of bullying and peer pressure in the paras and apparently they are the worst in the army for behavior. I was gutted to hear this as i was rather interested in it. They recommended i look at the Royal Marines as they are 'thinking soldiers' and very professional in comparison to the paras and ''would never fight each other as they are a brotherhood'' . Is what they were saying true? as im currently leaning more towards the Marines. Thanks in advance