Historical clue formulations

• Like cheesecake vis-à-vis sponge cake — 2026-08-02
• Wealthier — 2008-01-28
• Comparatively flush — 2007-05-20
• Comparatively creamy — 2005-10-14
• Worth more — 2001-02-25
• Comparatively vivid — 2000-02-19
• Higher in fuel-to-air ratio — 1997-03-05
• Having more butter and cream — 1996-12-26
• "...for_____for poorer" — 1993-12-07