Those are all great options from what I've heard. I've tried Didymos, Storchenwiege, and Easycare (even with a 3 year old they are great), as well as Gypsy Mama BaliBaby Breeze (super lightweight fabric great for summer, needs more care to achieve comfort with a heavy child in my experience) and Ellaroo (intermediate in thickness & comfort). I started late and never really did the stretchy wraps so just going by word of mouth there. :)
The most compelling argument against Bjorns (strictly IMO) is that, comfortwise, I'm told, they are outgrown so fast compared to a wrap, mei tai, or even stretchy wrap or ring sling or pouch. Thus, better to invest in something that will be comfy for mom & babe much longer.
mom to DS (march 2003) and DD (may 2005)