Just another vote for the ergo - we used it on our first trip to WDW (DS was 16 months at the time) and it was a lifesaver! He had very little interest in the stroller, but was perfectly content in the ergo. Like a PP said, though, a lot of it comes down to personal preference and shape. Try to go somewhere where you can actually try on the wraps and slings (and make sure to put some weight in them when you put them on.) If you have a Buy Buy Baby near you, they have a whole bunch of the baby carriers available to try on.