Beco Butterfly Advice About Ergo Or Beco Butterfly Carriers?

Advice about Ergo or Beco Butterfly carriers? - beco butterfly

I have this in newborns and infants - sorry for the repetition.

What is the best in your opinion? My baby has more than 9 kg (20 pounds) and I would try to support him. The inner Beco makes me feel better, put baby in the back, but is very expensive and I wonder if anyone else has input? Thank you!