Well let me think about this...
Mountains
Colder
More bugs
More likely to die of hypothermia, exposure, moose trampling, bears, etc.
Have to wear more clothes
Harder to walk through (hello, passes!)
Have to carry more stuff to keep warm and protect from bears, etc.
Trees blocking the views too much
Deserts
Warmer
Less bugs
You can practically walk around naked
You don't have to carry much
Not as many things are trying to kill you
Less trees = more views
"Strolling on, it seems to me that the strangeness and wonder of existence are emphasized here, in the desert, by the comparative sparsity of the flora and fauna: life not crowded upon life as in other places but scattered abroad in spareness and simplicity, with a generous gift of space for each herb and bush and tree, each stem of grass, so that the living organism stands out bold and brave and vivid against the lifeless sand and barren rock. The extreme clarity of the desert light is equaled by the extreme individuation of desert life-forms. Love flowers best in openness and freedom.” - Edward Abbey
"Back to the earth, back to who I am and who I am not, back to my kin, the sandstone in my veins." - Katie Lee