I have an Ergo and a Moby wrap. I can't comment on the Infantino but wanted to chime in that the Ergo and Moby are two VERY different carriers.
I love my Ergo. DD always falls asleep in it. And she can nurse in it. I was using it since she was about 5-6 weeks old. I just put a rolled up towel under her bottom and held her head until her neck was a bit stronger. I love that the weight is mostly distributed on to my hips.
I like the Moby. There is a steep learning curve to it. And if I don't get it just right DD cries. And then I have to unravel and redo the umpteen yards of fabric. But for those willing to invest the effort is mastering it, it is a very versatile wrap. And I like that I can carry DD out with me to a nicer evening event without the sporty look of the ergo.
I could live without the Moby. But I wouldn't give up my Ergo for anything.