Really, it's your choice. But the thing to keep in mind is that the majority of pepper plants only put out peppers at the nodes - the spots where stems and branches part from each other. Because of this, the more stems/branches, the more production a plant will have. If you want more production, you will want to feed them more for growth first, then switch to a flowering feed when you think the plant's ready. Note the plant will still put out flowers, but it will focus on those flowers/new pods instead of growth as long as they remain on the plant - this is why some people pluck the early flowers, to force the plant to focus on growth.