I like both decks but I'm picking the Streamlines. Erlanger-made Streamlines are of surprisingly good quality and have a more attractive, less generic back than the Aviators. The Arrco faces are a nice change of pace, as well - reminds me of the old Studs.
BTW: in addition to being inexpensive USPC-made decks, they're also the only commonly-available USPC deck brands made with a smooth finish as standard.