Topps/WWE seems to do two sets per year...
They do the standard set with base, inserts, parallels, hits, printing plates, etc...
And then another, less expensive smaller set with much rarer hits and an emphasis on an easier-to-collect base set. I think these 'secondary sets' are more youth-oriented.
Other 'secondary sets' like that were Champions and Ultimate Rivals. Smaller base sets and no/fewer inserts.
What i think makes Classic so nice looking is that the photos are studio shots rather than action shots, which is what makes up 99% of WWE trading cards images. Not that i don't like action shots, but its nice to change it up once in a while.
Plus... they are all foil and it looks like they use a very similar design to 2011 Finest baseball. Classic is one of my favorites!