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currently grinding through lava walls th9...legos were much easier to get..but yeah walls make a huge impact...other guys in my clan have skulls and they get targeted first...and i am able to defend well...and as far as jump spell goes it makes a big difference if the attcker wastes one spell as jump while he could do better with extra rage or heal..so upgrading walls suck, but its worth it!
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As stated by another, it depends on own gameplay and no-life time spent on walls.
My initial was purple wall at TH8, and only quarter skull before upgrade to TH9.
When TH9 finish, I got half skulls. My target then was full skull only even at max-TH9.
Somehow, loot is not that hard sometimes, and I manage to finish skulls by early TH9.
Now mid-TH9, I got about 1/8 Legos, plan to do slowly and will go TH10 once maxed all TH9 except walls and heroes.
Then SC allows elixir to upgrade walls. I'm currently 2/5 Lego done. Plan to max Lego now only, and do Lava slowly whenever free.
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I plan on staying at th9 until all my defenses are maxxed and i have at least all lvl 9 walls. Then if there is no th11 announced yet i will stay at th9 and grind out lvl 10 walls until th11 is announced and then ill move up.