Forgive me if this is an extreme noob question or if it has been answered already please point me to it.
I've gotten the game for my kids and they love it. We have a bunch of powerdiscs and some duplicates that I know they could probably trade with their friends.
Some questions though:
1. Are any of these more rare than others or are they all about the same?
2. Is there a reason to keep multiples of one or is one enough to keep?
3. Are the ones with the holograms any better than the other ones? Should we keep them because they they have the hologram?
I'm sure I'll have more questions but these are good for now.
Thanks for the help
Josh