Pekkas and Dragons should be swapped
As the title says, I think pekkas should be unlocked at barracks level 9 at th 7, and dragons at barracks level 10 at th 8.
I am sure many of you have been experiencing th 7-8 clan wars consisting of everyone spamming mass dragons on everyone, be it with 3 rage/heal or 3 lightnings. A troops should not be so powerful that the best strategy for 3 wars would be to spam only that troop and that alone, but that is currently the case, especially at th 7. A mass dragon attack is virtually impossible to fail at th 7 due to only 2 air defense, if you bring 3 lightnings you only have 1 air defense left.
Sure, if pekkas are used on th 6 (1 th lower) it would be devastating as they do not have hidden teslas yet, but I believe dragons on a th 6 are even worse with only 1 air defense. And unlike pekkas, dragons are flying troops and bypass walls, while it is much easier to channel pekkas away with walls, outside buildings, etc. Pekka can be made to a 20 housing space troop and dragons 25 with their stats adjusted to go with this change. Even at th 7, I've had a th 8 attack me with 4 pekkas and some other troops, the 4 pekkas ended up walking around the whole base and dying to teslas. The equivalent 5 dragons would definitely have done more damage and reached my storages.