Max Walls or Upgrade TH

Should I max my walls to Lvl 5 or Upgade my TH to Lvl 6

Question you need to ask yourself is:
if you upgrade without maxing, are your walls and defenses going to be strong enough to protect the higher amounts of loot you need to collect for upgrades at the next level.
Answer: probably not

It's a good idea to completely max out your defenses/walls before upgrading your town hall. A surprising amount of people rush this.

Max walls completely