I think it depends on you. The fact that you are even asking the question suggests that you are probably like me and will stress at the waiting/pushing/rudeness.
For the MK parades, we have found that sitting on the rocking chairs outside Liberty Tree Tavern is our best bet. You do need to arrive well in advance (an hour and a half, probably) and make sure you move the chairs to the front edge of the verrandah so that no-one can sit in front of you. Just chill and do some people-watching while you wait!
For the AK parade (currently the best at WDW IMHO), arrive an hour before the start and grab a spot in Africa. We always sit on the wall outside the restrooms opposite Tusker House - the parade starts and finishes here, so you can see it twice if you wait. If you arrive early enough, you can sit on the front edge of the wall and no-one can sit in front of you.
The MGM parade is also surprisingly good. Again, get there an hour before and stake out a place right where it begins near Star Wars. You will see bronze markers on the floor. We usually wait in a small area outside the fast food eaterie there. People will keep coming and standing in front of you, but a CM will just keep coming and moving them on! Just arrive early and ask a CM where you need to stand.