We have an ergo and I love it!! I am 8 months pregnant and I can carry my 18 month old with no problems at all. I am very small and it fits me, it fits my 6'1" husband, too. So pretty versatile. It really is comfortable, the best backpack I have tried. But I am not really a sling/wrap person. I haven't used the hip or front carry yet, though.
Hope that helps a little!