Who wins?
Slime vs Wither
Wither wins 76% to 24%. 21 more put them in the same row. From Minecraft Mobs Tier List. Pick a side.
WetDumpling84 on Slime: slime farms in swamps at night give you sticky pistons, not as useless as people think
crispy_badger_46 on Wither: summoning it in the Nether and fighting it for the beacon is the best endgame project in the game
Minecraft Mobs Tier List: the full ranking