In terms of carriers, some may say that I have too many! I suppose I do, seeing as I really only use 1 or 2 of them.
To summarize, here's my latest view on baby wearing devices, in order of preference...
Ergo - My go-to carrier. It buckles on easily, can do a front or back carry, and holds up to 45lbs (I think ... I still put Kai in it occasionally if she's melting down on a walk). Has a built-in hood to hold their heads up while sleeping & protect from sunlight. note: you need an insert if you want to use this with a newborn (to life them up so they sit properly in it).
Mei Tai - my fave newborn/wee baby carrier (and all around one, although not as quick as the Ergo). It's essentially a square panel of fabric with 4 really long straps that wrap around your waist & shoulders. Front, back, side carriers all possible. Major drawback is that the long straps tend to drag through ground slop in the winter if you're trying to put it on in a parking lot, etc.
Ring sling - I have one, it's a super quick in/out thing that is handy if you're running into & out of the car quickly (Ergo is also good for this), or if they're napping on you & you don't have extra hands to strap you into the other more complicated carriers.
Pouch sling - meh, I have one but never really used it. Just wasn't the right fit.
Wrap - never had one (due to my overabundance of other carriers I had a hard time justifying one), but I've never heard a bad thing about them!!!
Structured backpack carrier - we have one from MEC. Handy, although doesn't pack down well for long-haul trips. Cooler in hot weather.
A good carrier should hold the babes legs up in a frog position, so they're sitting with knees higher than hips. You should also have the baby high enough that their head is "kissing height" (trust me, that's all you'll want to do when they're on you!)
While these carriers seem expensive, you can totally sell them on kijiji when you're done with it! I actually found my Ergo on kijiji!
Happy baby wearing!