Well if we go out with regular rules of how things work out and give superhuman hearing with blue pill on top of extreme strength I could see Björn picking that, like he would need to be almost as well aware of everything that is going on as others just based on hearing and even better as it could allow him to keep track of things happening all around him, not just thing in front of him. But as description doesn't mention that kind of hearing I assume it would stay as it is and render any player useless who picks that (or most of the other pills) so to play it safe I think he could lean to orange pill to make sure any rogue allergies don't start hurting him at later ages as you can never know what you might develope as time goes by and when other options are pointless or harmful might as well pick this one.