My AQ has been in constant upgrade since lvl 5 and I am all set to make a straight run to lvl 15. I mainly did this so I wouldn't feel the pain of missing her in battle (since I have only actually gotten to use her a handful of times)
My BK is at 10 but I am not sure how much I am going to grind after lvl 15. The raiding demands to keep one or the other going gets allot steeper after you hit that 7 day marker. Sure lvl 20 is quite doable and lvl 40 heros are monsters in battle but dang its allot of time and raiding.
My take is I'll try to keep one or the other going as much as possible. When I hit TH10 I am hopping having that 3rd DE drill will help some. As someone who maxed out their drills relatively early (after camps) I'd say its worth it for those of us wanting to grind out hero levels. Getting 4,800 a day just from drills really helps in the long run. So I am really hoping bumping that to 7,200 will greatly help. Not to mention that during a boosting special this is a monstrous help (which is why I have maxed hogs, lvl 3 valks cooking, and I am all set to get AQ to 15 in a straight run)








