Congrats on your decision! Sounds like you've put a lot of thought into the options and have covered your bases.
The biggest advantage to the factory w/d option is they are installed when you get it. Mine are still sitting in the garage
. Several folks have installed aftermarket units with larger capacities and have even wired for a 240VAC dryer which is faster drying. The only disadvatage is it takes a little creativity to get them installed.