User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-122.167.44.112-20130605170659/@comment-24339098-20130606201101

Percy is more powerful because he's older than Jason though it is very close. Also it's been almost a year (in book time) since he last saw Nico fight, I'm thinking that his powers have developed a bit which we will see in HoH.