>>4388871>ball headThey're a meme, limited strength and the only advantage is that they have unlimited different positions within their range. Problem is, is that their range is pretty small, and there's basically no reason to use the roll axis on them as they can rarely get you 90 degrees, so not enough to do a portrait shot unless you get a slotted one like
>>4388894. Even then though, they're not really stable enough for a heavy camera. Get a fluid head instead.