View at Mutianyu or Juyongguan pass, which 1 more beautiful ?

Which 1 more beautiful view from Mutianyu, Jiankou or Juyongguan pass ? I saw from pic there is a river or lake at Juyongguan pass......is that far from enter gate ??? Or we should walk view km b4 we found the river/lake ??? I heard we can use helicopter to get nice view from above....where we can rent helycopter n how much it cost ??? Thanx U in advance......!!!!