I honestly love both equally, so here are my favorite styles from each company:
CAPCOM: Capcom vs SNK, Marvel vs Capcom (more specifically, how Capcom drew and animated the Marvel characters), JoJo (Heritage For The Future), Street Fighter 3
SNK: Real Bout Fatal Fury, Garou, Art of Fighting 3, Last Blade
If I had to really choose which I prefer more, it probably goes to Capcom because I love their art style in general (Bengus, Akiman, and Kinu are some of my favorite artists). It doesn't diminish my love for SNK though, and I think they are titans in their own right, and anyone who denies that is out of their collective mind.
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