I'm HUGE into babywearing...I have many many carriers and woven wraps. I personally think there is nothing better than the snuggles of a wrap. Moby is a great start! I experienced the opposite of Amy. He felt so secure in it. He would sleep for hours!! Ergo is a great carrier too....but no where near as snuggly. It's great for a quick shopping trip! So my answer is you need both LOL! And if you decide you love wrapping...once baby hits around 15 pounds the Moby gets saggy. I know they say 30 some pounds but trust me the support is not there! This is a GREAT first woven wrap.
Most people start with the 4.6 or 4.9 for size!!!
Let me know if you have any questions. Baby wearing has become a huge part of our lives and I love it!!!
Here is a pic of one my wovens in a back carry. You never wear baby in a back carry in a moby. They are to stretchy and baby can flip out easy!