If I recall correctly, the Yukon and Rincon, are pretty similar with the Yukon being a step up from the Rincon. Chances are it has a little better parts, but being used if may come down to how each was cared for. If the bikes are close asked if you can take each for a ride. One may just seem "right" for you.
Welcome to the forum. Hey take a pic of you and your "new" bike when you get it, you'll want to save it for the before and after thread we have here.