It depends on what your soil already contains for nutrients...if your soil is already chock full of nutes, then adding more is just going to give you an overabundance and cause lockout/salt issues. If you are working with a good potting soil + perlite mixture it usually has quite a bit of nutrients already in the soil, so doing a feed/water/feed method is preferable, but as she really starts to bloom if your pot size is not large enough you'll find you'll need to feed every watering...
So as you can see it depends on your conditions as to how you feed/water them...soil conditions vary widely so you have to compensate