Seeing A Subset

 Sometimes it's better to just have an insert set instead of a subset in a base set, here is one I'd always prefer as an insert set...prospects.

I like my base sets being current stars, maybe all star subsets or coaches or refs, but leave prospects separate.  Once they are in the NHL, go for it.

I won't have on the design here, it's fine and very 90s Upper Deck.

What, if any, preference do you have between what should be a subset versus an insert set?