I went to a baby store today and tried both of them with my friend's 6 month old son. You really can't go wrong with either, but I preferred the Beco Gemini. It is a nice option if the child likes to face out (as her son does). You also don't need an infant insert for the Beco. The Ergo insert seemed like it would be hot for a spring/summer baby.
I was debating btw these as well. I ended up choosing the beco butterfly 2. The infant insert is much lighter weight and I live in a hot climate so that was a big selling point for me. I also just think the beco is much prettier. They're both great so you can't really go wrong with either.
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Re: ergo vs. beco
HarCoMommy: You know my vote is for Beco Gemini. But they all seem great! And your LO looks super comfy in her Ergo.
HARDEST CHOICE!