i have had every sling known to humanity, probably. Including some I had fashioned myself
here's what I have learnt. I HATE loads of fabric, esp when I weigh 2 stone more than usual, and I HATE loads of faff. I also hate the hotness from being swathed in great layers of fabric, the tug on my shoulder from a side sling, not to mention the "tyre round your shoulders" look.
I also developed back problems which my very lentil weavery osteopath said was partly due to using a side sling after birth (when muscles are easily pulled)
So for me, i am sorry, but the baby bjorn is the best for right at the beginning, or the ergo with a newborn insert (there are funkier versions, something like the yammuto (sp?)).
No spare fabric, no back probs, the newer bjorns ones don't stress the spine but the ergos with the insert don't anyway.
honestly, you name the sling and I have tried it.