If you're tossing up between HAB and SW, go the Sleepy Wrap. The virtue of the HAB is that it's Australian and made by a WAHM company.
I used one (a borrowed one) with DS and it was great...just got way too stretchy for me to use it from about 4.5 months onwards so we moved on fairly quickly.
My SiL has a SW and loved it, wearing her DS for longer than 6 months. I bought one for my cousin who also loves hers. It's less stretchy...which ends up being a good thing for using it longer.
I would have got one this time round, except I'm ready to go a woven cotton. I hear that woven materials are a bit harder to use if you're using a sling for the first time, so the SW just seems ideal