I will go for a Carrier. A sling is only good when they are newborns I feel. As they grow older slings are less comfortable . I personally use Lillebaby carrier. Ergobaby 360 was one of my choices at first too but I recalled you need an infant insert when their neck is still not stable? I feel infant inserts make babies very hot and is additional cost.
Lillebaby can be used for babies since birth without infant insert and it also allows for front facing position. You can check it out. The prices are less steep too
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