Flower.... seriously?
If I were to tell you, that your plant right now put into bud, both your plants combined will give you 4 grams max....would you still ask question?
SO: Wait...wait...wait....
the longer the veg, the larger the yield.... I mean, you want to flower that sativa for 12-16 weeks, and only get 3-4 grams? That would be a solid waste of time.....IMO....
If one is a sativa, and the other an indica, one could finish in bud at 7-8 weeks, and the other will keep going and going....
Good Luck man....