Health or Attack for Ken?

Working on making Ken Stronger, but I’m unsure about whether to increase his damage by upping his hp or base attack. His skills say that they increase based on his max health, but I’m not sure if increasing his health would give a better attack buff than just increasing base attack. Thoughts? Thanks!

Just talking %s, His ability to increase total HP is naturally better than increasing his ATK via equipment. I don’t know the proper ratio of increase, but being his HP is already absurdly high, I would build more into that. Allowing him to get hit more and gain more Fighting Spirit would let him use his last skill more.