A perfect mix of icons & absolutely subjective all time favs with a drop of oddity... tough.
Icons would be: Nam-1975, Magician Lord, Fatal Fury, Art of Fighting, Viewpoint, Samurai Shodown, Top Hunter, KoF '94, Puzzle Bobble, Metal Slug & Mark of the Wolves.
All time favs: Whatever you desire.
Some, but at least three, out of those off-beat gems to round it up: Cyber-Lip, League Bowling, Crossed Swords, Andro Dunos, Windjammers, Over Top, Waku Waku 7, Super Dodgeball, Twinkle Star Sprites, Magical Drop III, Shock Troopers 2nd Squad, Nightmare in the Dark & Matrimelee.
...plus the allegedly worst & best game ever: Legend of Success Joe & Neo Turf Masters.