Higher: The Heirs (My 8.5 vs. your 5.5). I keep repeating that the Heirs is my guilty pleasure despite not being a great show :D I just had so much fun seeing the people's skirmishes.
Lower: surprisingly, I had quite a few that I rated lower. The main one would be My Lovely Sam Soon (Your 10.0 vs. my 7.0). I actually wouldn't probably rate it as high now. I think that it has a very repetitive theme, and I didn't really enjoy the main leads interactions that much.