Biggest baseball card fall-off one year to the next

So, what's the biggest fall-off from year to year as to the appearance of Topps baseball cards issued in the 1960's? In my opinion, it would have to be 1965 to 1966 Topps.

The 1965 Topps set was so primo and beautiful, an explosion of color. On the other hand were the 1966 Topps cards, with their pennants making a diagonal slash across the top corner, denoting the team. I was tempted to choose 1968 as the ugly duckling, what with its awful brown-yellow hatching that looked like hay scattered in a chicken coop, but there's something extra awful about these 1966 Topps that I'm having trouble putting my finger on. . . .

Maybe it's how some of the players are sopping wet with sweat, or maybe the way so many of them look like they just got out of rehab. It must be a combination of those two. I always try to put a positive spin on things, so I'll try to think of 1966 Topps baseball cards as a celebration of bad baseball card design.

1965 Topps Baseball (the good)

1966 Topps Baseball (the ugly)

My home