For me it is hard to say, as both run excellent on my PC. Definitely Syria required much more RAM and is more resource intensive. SoH map never gave me any troubles, low level over Dubai, whereas low level Damascus, Adana or Beirut can bring slower PCs to it's knees.
My average Syria map fps is 80 with over ~ 180 at 25000 ft and 46-68 over said cities at rooftops.
Sun, shadows and overall quality affects performance. I am at high default preset with secondary shadows on for SC and in 1440p resolution.