I have the Sport and love it because as a plus-size mama it fits me just right. My DH is 6'3" and it fits him well too. I've not tried the original ones, but was afraid they'd be too snug on me and too warm for our baby. The Sport has a fabric that is supposedly less hot.
It really depends on where you live, how you are going to use it, and whether you and LO get hot or cold easily. I love my Ergo Performance because it has mesh along the sides and cool wicking material. I also like the little stow away hood that I can snap behind LO's head onto the shoulder straps to provide extra support while sleeping or extra shelter from wind/rain. I know DS and I would overheat in the summer if we had bought the original, because we both overheat easily.
That being said, I think you really can't go wrong with any of them.
Re: ergo...
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It really depends on where you live, how you are going to use it, and whether you and LO get hot or cold easily. I love my Ergo Performance because it has mesh along the sides and cool wicking material. I also like the little stow away hood that I can snap behind LO's head onto the shoulder straps to provide extra support while sleeping or extra shelter from wind/rain. I know DS and I would overheat in the summer if we had bought the original, because we both overheat easily.
That being said, I think you really can't go wrong with any of them.