I tried out the Ergo a couple of times, but James always wants to nurse once he's in it which I haven't figured out how to do yet.
So I've mostly been using the Moby and I really like it. This hold is called the "breastfeeding hold, I can breastfeed him while he's in there and then he usually falls asleep in a few minutes:
The moby is basically one long strip of fabric, that you fold and wrap around you so that it holds him near you. It is a little overwhelming at first, but it is already getting more automatic for me after only doing it for maybe 4-5 days now.
I tried this hold out once (the lotus hold), but it didn't support his head very well while I was moving around.
But I can see how this would be a fun hold for when he's a little older and able to hold his head up more.
The same is true for the Ergo. I can tell it is a really supportive carrier and will be better for my back once he's able to sit up better, so I'm really looking forward to using that more, too.
In general, I'm really loving baby-wearing. I'm able to clean up around the house while breastfeeding him and "holding him" and rocking him to sleep all at the same time!