@BlueChampagne If you are in a hard water area the soap based shampoo bars may not work as well for you ( can leave a lot of waxy residue which can be useful to a point to help with any frizz but can get too waxy).
Shampoo bars that are not soap based work well in all water (so I've been told) these are more like regular shampoo without the added water content.
To tell the difference between the two you need to look at the ingredients list.
Soap based bars would have ingredients like sodium cocoate, sodium olivate and sodium castorate similar to a cold process bar of soap. I've used these with success but it depends on how dry frizzy and curly your hair is and the hardness if the water in your area. I think when people say they don't get on with shampoo bars maybe this is the type they have tried.
Non soap shampoo bars are more like regular shampoo. These will have ingredients like sodium cocyl Isethionate (sometimes listed as SCI) , decyl glucoside and disodium lauryl sulfosuccinate.
I've tried the following so far and would buy them all again.
Shampoo soap based -
Friendly soap, The Natural Spa, The Good Soap Company.
Shampoo non soap based.
Ethique the frizz wrangler, Ethique healy kiwi and Faith in nature.
Conditioner bars that I recommend are-
Friendly Soap - quite a heavy lots of slip conditioner.
The Natural Spa - lasts ages and not as heavy as friendly soap one.
Ethique - The Guardian conditioner bar probably the best but also the most expensive!
Hope that helps, realised I've waffled on for a while there! Hope you find something to suit you 🙂