Every fighter on the Neo Geo Pocket Color was awesome I thought, even Fatal Fury was pretty good, and I think it was SNK's experiment at pushing the animated sprites up to the 4 color limit, because they are colorful! Compared to the other fighters. Maybe that contributed to some of the slowdown? In any case, My ranking is as follows:
The Last Blade (Perfect port of Last Blade 1 and Last Blade 2, two games in one! Well, sans Last Blade 1 background graphics)
Gals Fighters (This is what SNK is all about, know thyself, and know others. Fantastic tongue in cheek humour and King of Fighters 99 style gameplay)
The following 2 tie in my book:
SNK Vs. Capcom Match of the Millennium (Barring a few strange bugs, like the DM giving evasion over fireballs, this is the match everyone was waiting for. Kick ass gameplay, fun olympic modes)
King of Fighters R2 (Near perfect port of King of Fighters 98, still the most clever AI, but where's the rest of the teams? Keeping Kim and adding King, as well as numerous others would have been fantastic!)
King of Fighters R1 (It's got Kim in it, that's why I love it ^_^)