Like SE said you will always have dandruff. The best way to really reduce visible dandruff is to eat better and stay hydrated. To manage dandruff I would say explore with your options, because what works for one may not work for another.
BS is a salt and can dry out certain skin types more than others. It does dry my scalp, but I've found that a rosemary, aloe vera, sage, and mint rinse afterwards does wonders to rehydrate my scalp. Best things about BS is that it is a salt and dissolves completely in water so it does not leave build up, and it also helps remove buildup as it acts as an exfoliator for skin and hair.
Dr. B's is good stuff. But it doesn't rinse well in hard water, which is something I deal with. I don't think it matters what kind you get, although I've heard liquid is harder to rinse out although I haven't noticed the difference. I stick to bars to minimize the waste of plastic bottles, which is a personal preference. What ever you do rinse with COLD water to reduce not only dandruff, but also cold water seems to rinse more effectively than warm water or hot water for that matter.
Honestly, explore and see what works best for you...like Ms. Frizzle says "Take chances, make mistakes, and get messy" or in your case get clean.