There aren't series that are inherently worth more than any other. What you're really looking for are blueprints where it's from the "OG" (or original) series. So, for one unique example from my list, Psyonix added painted Lightspeeds to the game with the Revival series but if you had unopened Overdrive blueprints, you could then start to get them from Overdrive because that was the OG series for "unpainted" Lightspeeds. In most cases, though, you're just looking for wherever an item actually started. Victory Infiniums are a more typical / less-unique / not-as-rare example, but it's still cool to find Victory because they've been subsequently released in Player's Choice and in a few of the Golden-Item series. It's really just a collecting thing at that point. Most people don't care, some do, it can be a fun and challenging way to trade for the buyer. I hope that all made sense. I'm just a fan of Scorer stuff, which is why all of mine are Scorer requests. lol