Both parades don't feature show stops so pretty much anywhere is a good location. But the Sun Plaza is usually the most crowded, the area in between the Vine and Bugs land is usually not packed.
It's usually the reason that it's close to the exit, once the parade ends, you can make a dash out of the park. I always watch it at the beginning for ELP at PP. For PPP, I don't care, I usually skip it.
Well since I work Pixar Play, I can say that if you watch it at Sunshine Plaza, you'll have IMO the best view. the curve in the route while allow you to have a panorama view of the floats if your in the center. It will be crowded, but I would say 30 minutes early would guarantee you comfortable seating.
as for Electrical, I say in front of that San Fran building thats never used. It wont be crowded, you'll have Paradise Pier as a backdrop, and because its not crowded all of the performers will look to you and smile and hold the smile for just about any photo you want to take.