I think the Denman brush is more versatile for all hair types, because the more features on the brush the more specialized the results and the more specific the hair type it will work for.

The denman will put less tension on the hair which may be better if your hair is very fragile.

Neither of them are good for detangling, or right for everyone. Some people’s hair is far too fragile for brush styling, or some people prefer volume over definition. Brush styling typically encourages shrinkage of the curls because of the Ribbon Effect caused by the tension the brush creates, but I would err on the side of caution if you have poor/ low elasticity,  very tangle-y hair, and if your hair is very long (it’ll be easier to use a paddle brush, also you dont want to be too rough with your long ends to prevent breakage).

While amazing results are possible with both brushes, the bounce curl brush creates more uniformity in my curls, does a fantastic job at smoothing frizz, and i love that it pre-seperates (majority) of my curl clumps, saving me time and frizz when it’s dry. I did find I still had to separate some of the curl clumps in the end, even with the unique sides of the brush, but thats a sign of healthy hair. The curl families just want to be together <3

If you have a curl pattern that is between 2b-4b, this brush will work best for you. Again, it cannot create curls that do not exist. 

I will definitely continue playing with the Bounce Curl Brush, and I look forward to more iterations of the innovation from Bounce Curl to cater to other hair types!