Alot of my friends use the BOBA carrier because apparently it allows for comfortable and discreet nursing while standing or walking. I've been told that there is no need to untie the wrap or loosen it to nurse your baby, just widen the shoulder piece and lower the baby to a comfortable nursing position and latch on. Here is a YouTube video that demonstrates how easy it is to nurse using a BOBA carrier. https://www.youtube.com/watch?v=_6RURnmo6ZM
I used baby bjorn for my eldest and ergo for 2nd. I put a nursing cover over to do it discreetly. I think, most importantly, mummy must find it comfortable first so that the baby can be fed well in whichever carrier.
I use the mesh material ergo baby carrier with the infant insert.