So… I’ve just closed off my last TC20 since I have duplicates of all S1 heroes (aside from Richard), and have more multiples of certain heroes which will feed the HA10. Spare food is being stored in AL and spare recruits in TC13.
The benefit of storing food in AL is that you don’t need recruits; however, you do need to have the ingredients. So it really depends on what you have for surplus.
As I mentioned, I use 8B for chance of tornadoes, feeding 5 bombs. Bombs are cheap for me to produce as I have more than enough crafting materials and iron which cost a total of 5x (33.9k iron, Metal Ore (2*), Midnight Root (3*), and Sunspire Feathers (2*)). Only the Midnight Root is the critical ingredient, but I’ve got over 900 of them.
You can store 220k of food for 2 days with the cost of 5x 3 star items, vs 300k of food for 2 days with 100 recruits in TC20.
As for 7B, I’ve got about 1000 of each 3* crafting material, and it only takes 5 of those, 94k food, and 1 day.
Like I said, it all depends on what you have for surplus. But that’s what works for me.