We have liked different carriers for different stages.
Ergo was great early on b/c DS was 6 lbs. / 8 oz. at birth and took FOREVER to get to 8 lbs., so we could use the Ergo with a newborn insert. Downside is that the insert was hot, especially in summer, and when his eczema was flaring up he did not want to be bundled up in all that stuff. And around 2 to 3 months he would not let me put him in the Ergo at all.
Around 4 months I tried him forward facing in the Bjorn and he loved it. (We have a Bjorn Active) I think he was at the stage where he just wanted to take everything in. Still didn't like the Ergo. But right now he is nearing 15 lbs., and it is tiring to carry him in the Bjorn because all the weight is on your shoulders and the small of your back.
So I decided to try the Ergo again a few weeks ago and since he is going through a clingy phase he is pretty happy facing me again. And I am way more comfortable since more of the weight is on my hips. DH likes the Ergo too except he has trouble securing the chest strap on his own -- you need to have pretty flexible shoulders!
We also have a Moby that has never worked for us ... I think the problem is that I am very short-waisted ... so DS can head-butt me in the nose when he is in it, and he doesn't sit low enough to support his shoulders. Also the Moby has zero appeal to DH.
If I were to do it over again I might look at getting an infant sling for the early weeks, but I'm glad that we had both the Ergo and Bjorn so that we could continue to baby-wear through different stages.
EDIT: there is a Bjorn model that has a hip/waist belt, I would recommend looking at that (Comfort Carrier) , but the web page says you can use it starting at 13 lbs.