Again, I still think you should do some math using the formula from below link:
http://www.edmunds.com/advice/leasin...5/article.html
Everyone has different credit score which does affect your interest rate (money factor in leasing term).
Each bank has their own residual value. Given the fact they should be similar but not exactly the same. A few percent on a $50k vehicle is a good chunk of change.
Also, just because it's a base model doesn't necessarily mean it must be cheaper in a lease. Banks do realize certain options will make the vehicle easier to auction off in 3 years. Therefore, higher models may residualize better. Again, that few percent = thousands. Which can make up the difference.