A hybrid for definite. It's not uncommon with hybrids to follow one strain more than the other, particularly from seed as each one truly is an individual. remember that twins are two plants from one shoot. are you in soil? can you investigate the root system? I merely killed one of them off on my grow but I'd be interested to find out if the roots are as one. It's more than likely they are which means that unless you take proper care of them one plant is always going to outshine the other and the other will probably die. Much better to kill the runt now. Gives the main plant more opportunity for growth.