Best Dragon

I had a an argument over which dragon is the best. I said fire and the other person said mountain. His argument was that objectives are how you win the game and the mountain dragon increases damage to objectives. Although that is true the fire dragon increases ad and ap. That would in turn increase damage to everything. Mountain just increases damage to the objectives while the fire would increase damage to objectives (although less than mountain) as well as your opponent. I just want people's opinions on the argument although this isn't very important.