same plants/one flowerd quicker

the one with bud grew alot quicker, thought it was a boy at first.

The one with little bud showed its sex first but is taking forever. I've been puting it in a closet on a 12/12 cycle for about a week.

the seeds are the same strain. (commercial)

Just looking for advice, tips. this was practice for next years plans.

should I of put the slow one on a 12/12?

Could be 2 diff phenotypes of the same strain mate. Quite a common thing. You can avoid this by growing clones taken from a single mother plant that displays the traits you like. Whether that be fast finishing, heavy yielding or both. And just keep a mother in 24 hr light for a constant supply of clones.