Fuji asked, so I'm answering. My favorite vintage card is my 1959 Topps Buzz Nutter. There are so many fantastic things about this card. The alternating red-blue lettering and the super-clashing pink background are just the beginning.
As for '90s inserts, my favorite is the 1992 Fleer Nolan Ryan Pro View:
That is one badass card. I guess it's not technically an insert, but close enough.