Actully, you can't really say because we have been with Percy every step of the way, but we havn't with Jason.

his monsters cant be worse then percys his first three were fury monitor and enchida

Jason killed the Trojan Sea monster and Krios.

percy have to scarfice more stuff than jason.

and percy fought kronos, 12 spartus, the minotaur, the kindly ones, medusa, echidna, the lotus hotel, ares,a pit scorpion, canadians( the canibals), bronze bulls, demon pigeons, a hydra, bear twins, scylla and charibids, cierce, the sirens, a big nasty cyclopes, luke, a manticore, a lion, a defactive talos, a giant boar, the dragon of eternal bad breath, atlas, held up the sky, (pause to breath) empuosas, telkhines, kampe, greyon, minos, and alot more nasties. and jason..... fought krios. mmmmm i think im rooting for percy