generally speaking , any map that drops Hashim or Yojiro (the 2 are bronze soldier/samurai with the " Lessons from the veteran" ability - which makes them when used as fodder to be considered as being from the same class as the target unit)are good farming spots for unit XP.


The most efficient map right now , it's probably Base scramble ll for general unit xp , but some specific maps may drop more depending on the class that you want to raise (as there are some maps that drop both a bronze of the class u want to raise , and 1 of the bronze units that i named earlier)






OFC it also depends on your level , since base scramble is a relatively hard map to clear for a newbie account





Now , if you are talking platinum armors , they are dropped either in the monday dailies or in events (with very low chances ofc)