Have no idea!

[feeb]

I got at ergo before DS1 was born, didnt like using newborn insert so I bought bubbasling which was great until 4 months then was hurting neck as too heavy. I then used ergo.

DS2 I bought close carrier before he was born and used it all the time from 1 week of age till 9 months. Now use ergo.

[MrsFabuloso]

You won't have to be out to need a carrier hun! I use mine all the time at home, more than when we're out. I have used a baby bjorn, an ergo, a peanut shell (pouch sling) and a wrap style carrier. My most favourite without doubt is the wrap carrier, but I have only used it in the colder weather. So if you live in a hot climate or it will be hot when bubs is born, it might not be the best one. Though generally, baby carrying can be pretty hot regardless of the style of carrier! I still only use the wrap and the ergo.
I love the wrap because it is so supportive. I have a terrible back and pelvis (I still have SPD and back issues from being pg) and I can wear DS in it for hours. I wear him around the house and when we go grocery shopping. Plus bub is really secure in it and you can use both hands to do other things, and move pretty vigorously with bub on and he doesn't get too jostled about.
I also love my ergo for going out on bigger trips, and when baby is bigger. It is supportive and comfy. I can still wear DS1 in ours and he's 16.5kg and 3y.o. in 8wks (OMG, really?? where did that time go, lol!???). It's great on long walks when DS1 will walk for a while, but not the whole distance, he will climb on our back and rest for a while. DH also likes the ergo and will wear bub in it too. He won't use any of the other ones. There are also new 'improved' designs out since I got mine, which is just a basic one. My only gripe with it iis the waist tether strap is fairly short and at a pretty normal size 16, it's getting pretty snug around my hips! And to buy the extension strap is more $$$.
The baby bjorn I didn't find too great and gave up when DD was about 7ish mths because it hurt me to wear her in it.
The peanut shell was ok for quick trips to the grocery shop when you don't want to get the pram out, or fuss with the other more fiddly carriers, but it does start to hurt your shoulder/neck/back after too long (about an hour or so I found). When we lived in our 3rd floor unit, I would carry DS1 in it, and help DD up/down the stairs so it was good to give me a spare hand then.
That's all I can think of, lol! HTH!