Feminized seeds very often carry hermaphrodite traits, you don't want to start cloning a bunch of hermies, you just end up with mostly seeds. You have to make clones of all your seed based plants, then grow your seed based plants to flower and see which ones carry the traits, then cull all the clones that came from the hermi traited plants. Keep the clones from the plants that showed no hermi traits. This should net you a stable female from which you can make infinite amount of clones. This takes time.
Regular seed based plants tend to have much less hermaphroditism and therefore once you have found a female showing pre-flowers you can usually just go ahead and make clones and skip the flowering process. saves lots of time.
I have done it both ways many times in the past. My current best mother came from feminized seed and the other one came from seed stock. I tend to clone 32 plants every 60 days.