This is the kinda dumb shit that leaves people thinking chanters are a god class. You read the percentage of the slow on allah. See chanters have a higher % on the highest level slow they get and just assumed it's better.
Bard slows don't have a mana cost which is very relevant in Classic, they have an AoE Slow, can be cast while moving and don't have a 1.5 second global lockout.
Before getting time slow stick the only time good enchanters even cast the higher % slow is on raid bosses and Shaman slow overrides it and has half the cast time.
Buff bitches
God Class
Pick one.