Upgrading walls. Inner-outer
When upgrading walls, what would be the most strategic route to go? All interior walls first then exterior or vice versa?
I don't think the level matters but as an example I am currently upgrading my walls from 7 to 8. This can also be for players that are just starting out as they go from 3-4 or 5-6, etc.
Inner walls first - This would be more beneficial because wall breakers have a tougher time reaching center cells, squares, partitions, or the soft gooey center of a base. Having stronger walls in the middle would make it more difficult for troops to fight their way through, without the assistance of Rage spell, and thus giving your defense more time to annihilate the attackers.
Outer shell first - This seems to be the more popular route that I see when I search for attacks. My theory on this, which I have used until now, is that a strong outer shell helps keep troops completely outside of the base and slows them down from the start as opposed to slowing them down in the middle. With the new wall breakers having a greater splash damage, I don't think this option is extremely viable anymore but still might be because now they take 2 housing spaces.
What are some of your strategical theories on it?