If you are confindent in the PvP zones doing events in there give the same amount of obols but also give you seeds of hatred you can also gamble with in the PvP towns. Double win that way.
Just kind of a bummer when someone 30 levels above you decides you are no long worthy of those seeds before you extract.
I normally don't bother finding events. Just do helltides, nightmare dungeons and legions/world bosses. Most often I run out of space for obols before I wvem notice