I've owned both the standard ergo and the sport. I needed the sport to fit my DH because he's quite tall and wide as well, so the standard one wouldn't fit him. Plus its a thicker material than the sport, so it was fairly hot in queensland, whereas the sport one was fine.

The original has snaps on their sleeping hood though, whereas the sport has clips, and the snaps are MUCH easier to do up yourself when you have a sleeping baby on you!!!

Both are good, but I sold both of mine because they were too short in the body for my kids (who are very tall).