In hot weather, the Ergo is too heavy and bulky.
As for the shoulder straps, the new BWD version is longer, at 23".
The downside is that Beco's are hard to come by sometimes. Because it is made in CA, not in a sweat shop, it takes longer to get your carrier.
I'm 5'9" and size 12 or 14. Both Ergo and Beco's fit me well. But I usually find myself reaching for the Beco's because I get comments on them all the time.

I'm a little vain.
But to be fair, the reason why the Ergo is bulkier is that it's pretty well quilted and padded on the body. And the outer fabric is canvas so it has less give and stands up to more movement.
Sorry I'm not much help.
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