@TheRock:
the first dragon usually dies within minutes or a few hours of it being sent, so it really doesnt matter which one it is. ruby is an excellent choice if u can get the 2nd dragon out quickly after the 1st is dead
and i also disagree with ur definition on sapphire dragon. if ur enemy dont slay it then u cant really send the 2nd dragon out. and if u r gonna send ur 2nd dragon on top of the first, then it will cost ur enemy a lot more economically to actually slay one than to keep a sapphire on for half a day