Based solely on design, I always though 1986 was terrible. Although that may be compounded by the fact that it's pretty much the most worthless set topps ever produced. Not a single notable rookie past Fielder.. If you lump in the Traded set, then I guess it becomes a somewhat noteworthy year for rookies.
All that aside, '73 was wrong on so many more levels, as Robert stated..
Design only-'86
Complete and total failure on almost every level of production-'73
Total worthlessness-'86
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