Our clan has our own forums and website that we like to post on to get a more personal opinion from our other clannies that we've grown to know and trust. We require a TH8 in our parent clan which is why I am assuming level 5 wall breakers but this isn't specific to just them. I wanted to share this publicly to get some outside opinions on this subject.
The purpose of this post is to create an open discussion about a hotly debated topic: Where to put your most upgraded walls, the inside or the outside? To alleviate some variables, I am going to assume level 5 Wall Breakers throughout most of my opinions. I'm also going to assume that the base's walls are split fairly even between one level and the next. Half gold and half pink would be ideal but I'll try to be more general than that. I also think its pretty safe to assume your attacker is using wbs.
We should all be able to agree that the first layer of walls are the easiest to get through during an attack. Whether it takes two wbs to get through that wall or just one, with a little bit of cover, it can be done relatively easy. The second layer of walls can be reached as well with wbs but as you know, it becomes just a bit trickier. The AI takes them to the nearest closed cell so sometimes when trying to reach that second layer of walls they end up opening another first layer section first but sometimes that's not too bad either cause usually on the next try you'll often get that second layer after you've deployed some more cover at this point. Now is when it becomes more complicated because if there is a third layer of walls keeping you from what it is that you seek, it's probably going to take more wbs than you have as they will continue to target closer closed cells in the first and second layers before considering diving into the third layer. So the third layer as well as some of the second layer in this scenario will have to be broken down by troops and this is where your defense can really shine.
Regardless of which level (not layer) of walls they got through to get there, they are now inside your base, smack dab (1st use) in the middle of what is likely the most defensively congested and most dangerous spot in your layout. Some of your defensive buildings may cover parts of the outside but they All cover parts of the inside. This is where you want their troops to get stuck and the higher level of walls you have on the inside, the longer they will be standing still taking the brunt of what defenses you have left. Whether your outside walls are pink crystal or black skulls, two wbs are going to open it right up. Its when wbs are not used when you really benefit from the difference in hitpoints between the wall levels.
Since your inside walls are the most wall breaker resistant due to the logistics, it is there you should have your highest level walls placed. If the lower level walls are in the inside, once the troops are in they'll have free reign over the place, destroying the inside and your most effective weapons faster.
Do you have reasons the higher level walls should go on the outside? tell us about it....
Do you agree with what I've said so far? I've left out a lot so please feel free to add to it!

