I think a shampoo bar is better if formulated based on what your hair needs, moisturizing vs cleansing, the kind of water you have and if you r going to condition your hair afterwards or not. Genny's recipe and the whole thread named 'shampoo bar-thanks Lindy!, has the concept very well explained and gives further tools to decide what you need in a shampoo bar and how to get there. I read the whole thread one night as I badly needed a good shampoo bar, that would let me go all natural and still have good, easily managed hair. I gained enough info and then made myself a very nice bar that met my requirements.
In case you r interested,my hair is dry, medium thick, waist length with lots of flyaways. Always looks frizzy even though it's generally not. My soap is 45 OO, 40 SAO, 10 CO, 5 CaO. I used many herbs for hair that Im familiar with like Amla, Henna, fenugreek, Hibiscus, basil, Rosemary. I did HP and and added 5%SF with herb infused EVCO. Genny's recipe has no coconut oil but I added some because I tend to oil up before hair wash and I need the cleansing from coconut oil.
The bar is nice and hard. I added sugar, salt and CA to the water before lye.