I liked watching DEP from back at the start, near Jumpin' Jellyfish. There were benches for those who got there a little bit earlier than I did, and it was a comfy place to be.
I haven't see PPP yet, and we never watched the BPB on purpose (DS didn't want to stand around to wait for it) just saw parts as it came by, and it's all so bright and colorful and fun, it always seemed pleasant (as I am sure the PPP will be as well) to view from anywhere (though I'm sure having a perfect spot would be better, assuming you don't mind getting sprayed with water!).