All lvl 9 walls or core lvl 10

Hello guys!
I've upgraded within some days all my walls to lvl 8 and now I am wondering if it would be smarter to upgrade first the core of my walls to lvl 10 and later on all my other walls to lvl 9. I am an early th9.

Any ideas?

Upgrade your defences first, those TH9 defences are not cheap.
Build the core of legos and see from there.

I would suggest doing the level 9 walls first.

Do the core to 9 and leave a builder free for walls to upgrade them with excess gold