We debated the same quandary when we bought our K. We went with the standard unit. With the up charge to purchase the L and with living in the frozen North, I didn't think the L would be a good fit for us. I justified it to myself (and more importantly to my wife!) by promising to always stay at places with 30 amp service or a hotel if it gets just to dang hot to boondock. $20K buys a lot of hotel rooms and campground stays.
On the Facebook group Travato Owners and Wannabes, an early adopter of the L, did a series of PDFs on the operation of the L unit. If you haven't already read them, it might be worth your time and help you decide on which model. From what I've read on comment, the PDFs are extremely helpful and well done.