I just got back from test diving both the SR+ and LR AWD a few hours ago, as I'm trying to decide between the two myself. I definitely felt a pretty noticeable difference between the two, with the SR+ feeling lighter and more nimble, while the LR AWD was felt much more planted, cornered far better, and had obviously a lot of power on tap (I could only do much with the Tesla rep riding along side me). The sound system was noticeable better in with the premium package as well, at all volume levels. I test drove these cars up in the SF Bay Area, on a normal partially sunny day, and both cars had 18" aeros
IMHO, the LR AWD was clearly better in terms of overall performance, but for my use case as more of a daily driver, I'm not sure it's going to be worth the extra $9K