I just bought another Ergo (my previous Ergo is about 6 months old). Anyhow, it appears that they made a few good design changes. The back strap (that goes between the shoulders) is sewn, so that it does not move. And, the privacy hood is a lot wider.
I would get the Ergo. I think that Beco looks good for entertaining, but the Ergo will be your ultimate "go to" workhorse carrier.
The Beco is more than just the beautiful print. The dimension of the body is sleek (slightly contoured) and the sleep hood can be completely tucked away without bulk. The adjustment on the BWD model is my ultimate favorite!!! It's like a Mei Tai. The other thing I like about it is that it can be rolled up into a neat little hip seat or just work on your back when you're not using it.
But the Ergo is made of hefty canvas so it might feel sturdier. And the body is quilted.
I'm obviously biased. I'm sure there are lots of other opinions out there.
The following is all Ergo v. 4th Gen. Beco, as a) I haven't tried a BWD and b) the Ergo and 4th Gen. are more comparable.
The Beco is a bit lighter-weight overall, so that's good for people who like a carrier to be a bit lighter/less heavy than the Ergo. OTOH, some people prefer the heavier-duty Ergo.
The Beco has a very cool rolling-up strap so you can tie it up and leave it on around your waist when not in use.
A big difference is in body height. The Beco is taller than the Ergo, which is great for people with taller babies/toddlers, but people with shorter/younger babies may prefer the Ergo.
The waistband on the Beco is padded, but not quite as thick as the Ergo. Again, some people prefer one and some the other. One comment I have heard is that some people have a problem with the baby slipping into the waistband part of the Beco, that it doesn't always fit snugly enough.
The straps adjust differently -- the Beco has two-way adjusters, and the longest part pulls up towards your head -- you get more flexibility in adjustment but there's also more strappage flopping around, which some people don't like.
The hood design is definitely different. I love the pretty look of the Beco without the hood attached or with the hood tucked away, it's very nice, but frankly I think the hood of the Ergo functions better because it's attached to the carrier (the Beco hood only sticks on with velcro, one tug too hard and it comes off).
I think they're both great carriers, but I don't think one "wins" over the other overall -- it's just simply a matter of user preference and comfort (and appropriateness for your baby's size).
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I had the ergo when DS was 6 mos. and me and DH hated it, the straps felt so bulky, now that hes almost 2 Id like to try it again though so I bought he organic denim cotton one.
I found this site when I was looking for a comparison..actually made me more confused.
edit- I agree about the ergo hood being better but with the Beco i simply don't need the sleeping hood- so far, the body is tall enough to provide some support. and to be fair, I haven't brought out the Ergo lately to be sure my review hasn't changed.
and The Nurture Center Store and Resource Center 3399 Mt Diablo Bl Lafayette CA 888-998-BABY
Personally, I prefer the Ergo. It's not as pretty, but DS' bum doesn't slide into the waistband when I wear it, which happens with the Beco.
PM me if you want links with evidence.