Now that just isn't a fair question
I think I would have to say Swaddlebees OV and Wee Notions wraps.
I would vote Bumgenius as I really like my new one, although it hasn't been fully road tested (no poo yet, lol) but they are just not very cute fabrics, I love patterns.
So I would vote Happy Heinys as they are beautiful but I just don't think you can beat a 2 part for reliability (especially as Charlotte has an upset tum at the mo' - connected to teething I think but only time will tell).
So yes Swaddlebees for cuteness, slimness, softness and reliability. Covered in cute Wee Notions wraps.