Lots of suggestions with several good points. I faced the same decision you are, and decided to keep my LR RWD. The primary reason is the difference in AWD and RWD feel. I prefer not to have the pull of the front motor during cornering and everyday driving. I'm an old guy, so rear wheel drive is my preferred road feel. If you want performance, clearly the RWD won't top a P model, but if you want more of a handling feel, perhaps you'll find the RWD is hard to beat. I still enjoy playing with a friend's P, but overall I'm happy with keeping the RWD.
The other point I'll make is that any EV has instantaneous acceleration whenever you want it. Despite the P car's faster acceleration and top end speed, in reality from 30-70 or 20-50 both cars offer similar performance. That, coupled with better steering feel, makes the LR RWD a fun ride in all conditions, not just straight line speed. Add to that the more comfortable 19" wheel package on the RWD, and overall for 99% of my driving the RWD is the better car.