A couple notes based on my own research and experience:

-I haven't heard the B&O system but the consensus is overwhelming that it sounds much, much better. Wish I waited for a car with that package.
-Coolant leak is impossible to find unless you take off the plastic tray and look under the driver's side engine compartment. The coolant could've been topped off if recently serviced.
-JB1 module is a mild tune so it wouldn't concern me. Also doesn't void what's left on the warranty.
-The LED headlamps which both have aren't great. I wouldn't say it's a plus on the 2016.
-Sport seats are much better but aren't powered. It's the only downside.

Personally I'd go with the 2015 since it has better options and I like white better. The 2016 is a better choice from a reliability standpoint. Depends a bit on your priorities.