I’ve had/have all 3.
The CB and BB are both gauze/muslin wraps and are fairly similar in wrapping, although the CB softens up more easily
I prefer the BB more, although that’s partly because of the colours/design LOL
Ellaroo I love the colours, but not fussed on how it wraps (doesn’t have the moldability and diagonal stretch of a Woven, it’s more like a thicker Gauze), or the fringes (although you can get them with no fringe).
There’s Wovens that are as thin or almost as thin as an Ellaroo, most are more supportive too, but they’re more expensive eg Ellevill Zara, Vatanai and some Didymos blends
Naturalmamas FSOT boards is great for preloved slings