wait until you get to the park to make the decision.
if you get there when it opens, you should be able to accomplish a lot before the crowds tend to come in.
nov 6th is a thursday.
usually not a busy day at the parks.
if around noon time the lines are extremely long, then buy the epp.
you would kick yourself later if you buy the epp in advance and find out you didn't really need them.
no refunds on epp.