Did they give you a material breakdown?Perhaps not useful since prices will vary depending on your situation, but here are the best estimates I received for each option.
Method Maximum Output Cost (including all parts/installation before tax) 14-50 with Mobile Connector (14-50 Adapter) 32A $1145 14-50 with Mobile Connector (Corded) 40A $1300 Wall Connector 48A $1480
As some of you guessed, the quoted installation cost ended up being more or less the same between the 14-50 and Wall Connector. The price difference mostly comes down to the cost of the Wall Connector vs Mobile Connector.
Are you going with the wall connector or mobile?