angels waste more mana and do less damage,my stradegy is to randomly just completly SPAM hobbits like there`s no tommorow,summon blue dragons cause they are cheaper and if you look at it do more damage then the angel,if the end comes into crossbow range fire all the types of arrows you got,this will kill all the minions behind the end and still damage the end a bit,repeat this process and the end will die before he reaches your castle...
fully uprgraded anegels also do less damage then fully uprgraded blue dragons,i was able to kill the end before he reached my castle with a crossbow,hobits,and blue dragons.