Who wins?
Spider vs Skeleton
Skeleton wins 72% to 28%. 14 more put them in the same row. From Minecraft Mobs Tier List. Pick a side.
GoldenWaffle66 on Spider: neutral during the day, the string is useful
grumpy_pickle on Skeleton: bones for bonemeal and the skeleton spawner farms are great
Minecraft Mobs Tier List: the full ranking