I have the ergo sport, but I havent tried the others. I choose the sport due to lighter fabric and because it is black..(too many colour choices with the others!) pretty basic reasons really, the lady at the place I ordered it from said other than fabric, colour, and that the sport is generally a better fit for dads they are all pretty much the same.

The hood clip things are a bit of a bugger, but I also havent really needed to use them yet.

Have to say it is the BEST money I have spent!!! DP loves it as well : )