But after the first couple of seasons they seem pretty consistent overall that Buffy is stronger than most vampires. She dispenses with them easily. And at some point or another I think both Angel and Spike mention that she's stronger. I think generally they avoided too many visual cues about it because it tended to look silly (such as the time they tried to make it look like teeny-tiny SMG was carrying Michelle Trachtenberg and the proportions just looked... unweildy. Troll hammer wasn't as visually silly-looking. But I never understood why a troll hammer would necesarrily be 'easier' for a Slayer. the mythology doesn't overlap and both Slayers and Vampires are demon-powered so I'm not sure where there would be an inherent preference (unlike Slayer Scythe which was a Slayer-specific weapon).