While I dislike them both a lot, I cant stand the Penguins. Everything they stand for, the lucking into star players by sucking for so long, almost moving, bandwagon fans, their p*ssy antics. Nothing satisfies me more than beating them.
The Rangers, I have a lot of respect for. They have a character team, stand up guys that buy in and sacrifice to win. They dont play dirty. Maybe I dont hate them because the Flyers have had the better of the play between the 2 years over my lifetime (minus the last season and a half). Their fans are similar to Flyers fans, have been around forever and still showed up during the down years.