We have now stayed at both Golden Nugget and Ship Creek this year. Neither are stellar.
Golden Nugget = spots are tight can be hard to get in to as access roads are narrow. Neighborhood tends to be loud and is not that great (run down mobile home parks) and you can get jet noise depending on how airport runways are configured for the day. Wi-Fi never works (too many people too little bandwidth). Laundry is big and always busy (machines out of order as well). Pluses are close to Costco, and decent utility infrastructure. Staff doesn't seem to care much.
Ship Creek = Spots are not quite as wide as GN (not saying much) but are mostly longer. In an industrial area, but well fenced. Train noise (or train spotting if you like trains) and sometimes light aircraft noise from the municipal airport (depending on runway config). Utilities are fine and Wi-Fi works but can be slow. Laundry is decent sized and are in good shape. You can walk to downtown (about 1/2 mile) or get to the bike trails. Park has a nicer feel than GN (more grass, trees, "nature"). Access roads are wide and spots are angled. Staff is pleasant and they actually hand out a comment card.
Winner: Think winner is too strong of a word, but would have to give the nod to Ship Creek. It is close though both are 1960's parks in dire need of some investment to widen spots (will never happen as long as the fill up every night).