Hello. Currently I am upgrading 2 teslas and have 2 builders free. My teslas are level 2 as I never thought they were good, but now going up to masters 2 I see they are great! I want to upgrade them, but at the same time want a lot of DE for lab upgrades. My dark drills are level 4, and I want to max them out ASAP. Should I upgrade all teslas at once or do 2 teslas and both drills at once?
Sorry if my english is bad
