IMostly depend of the build you use.
In build Tank Hallmark is use and seal of Righteous not, because, due a ruby, hallmark give a little bit shield.
In DPs there are 2 build one Holy one Physic.
Most of Paladin use holy, and it's focused on Incinerator skill and AOE damage,seal of Righteous need only for stack up more faster the final strike, that need for maximize the damage of incinerator, and take only one cannon not 2 like Seal.
The Physical build use not hallmark but chained that is linked with hallmark. Physic build is most for PVP, and Holy for PVE.
In single target Physic do more damage than holy, but in multi target no.
I hope is clear. But in next patch Pala change again will see.
Bye
This post has been edited 1 times, last edit by "cybercase" (May 4th 2017, 11:22pm)