To me, I can't really say I have a favorite from anything produced after 1977. The new stickers just look too pristine. I like the old OS with their nostalgic look. Much like I prefer Fenway or Wrigley over the fancy new stadiums they build today.
I get it... (slightly off topic) but after visiting both Fenway and Wrigley (the latter... kind of a *cramped dump. *awaiting hellfire to rain down any minute
) I do prefer some newer ballparks after the 60's to 80's turf, multi purpose cookie cutters like Three rivers, Cincy, Cardinals (old Busch) or Fulton County to name a few. Coors Field, Petco, new Busch, and the crown jewel that is Oracle Park in SF are all fantastic.
That being said, I was a bit too young to "fully" appreciate the 70's series but 'discovered' them in the 79 - 80 reprints (when my world was changed). Ebay has been my friend in acquiring quite a few of the OG titles but there are a handful of newer titles that for some reason bring the nostalgia back for me anyway... Along with the thrill of the chase..
85: Greaser's Pieces, Ghost soap
2006 ANS3: Yeti Whip, Del Monster, Hopeless Fruit Fly (I was and will always be a fan of Hostess Fruit Pies), Red Veins (foil)
2006 ANS4: Stubble Bubble, Bom (I like anything with a sparking wick - my all time fave is Regal Clown)
2007 ANS5: AI, Haunts Ketchup (I like any 'horror' related wacky)
2007 ANS6: WMD-40, Much & Yuk, Duraflume
2010 ANS7: Maggoty Ann (an all time fave)
2013 ANS11: Benjamin Morgue
2014 ANS12: Brainy
Obviously few and far between as opposed to the 70's series but still a few that scratch that itch. Also quite a few of the new Old School titles.