In the end, I made the choice to upgrade BK because my DE is overflowing already. This is going to be a problem in the future when I max my AQ which is going to happen in less than 4 weeks. However, DE armies just take way too long to train and I will effectively cut my loot in half just by using dark armies. They are also not much stronger than barch unless I use spells which are all elixir based.
AQ waking up in 4.5 days and BK waking up in 5 days, yeah this is a problem. When heroes all took 7 days to train, this wasn’t a problem but now it is with heroes less than lvl40. Fortunately this issue is not going to plague me for long when I manage to get BK to lvl40 in less than 60 days.