The best way for farming DE is the way you can profit the most DE per hour. It has nothing to do with how much you spend.
I can attack up to 10 times per hour with BAM. No way you can do that with BARCH. I guarantee you as a th8 or 9 between 1600-2200 trophys you will PROFIT more DE using BAM than you will BARCH.
Maybe you've never heard the saying "You have to spend money to make money."
I get there are better ways than BAM to farm DE. But BARCH isn't one of them.
edit: and my point was about gold farming. BAM is way better for gold farming and you can still profit DE if you just take some time to learn how to use it properly.





