Personally, I have very sweaty after the (summer) birth and "suffered" under the mole of the sling.
Quantities of substances in the body does not allow under certain circumstances and durable look. The Baby Bjorn fits under most jackets incl child underneath.
The winding technology of the sling must be learned and will certainly someday well out of hand. I like the Baby Bjorn that I can reinsetzen the child alone and uncomplicated.
The support in the lumbar spine I find very pleasant.
My child has hated because it could not look good and it was too narrow for him the sling. The Baby Bjorn was good because it could see more, still had a headrest and later could look also forward (in direction).
The arguments against the Baby Bjorn are comprehensible to me, but the ideology of "war", which is passed to the "right" Tragesstem, is superfluous.
The dosage is important - as with everything.
At a stretcher are two: the child and the transferor.
Therefore, it is a personal choice and not an ideology.