It really is a matter of preference. If they are polarized (positive and negative) you will need to orient them right. But really it’s preference. Some prefer polypropylene to the polyester. The Orange Drops come in a couple flavors, the 716p and 715p series. If you use radial lead, be careful to not break the epoxy when stretching them for the 2stroke board.
But cap selection is part of the fun!