Impossible bosses aren't really fair comparisons lol. That's just the game being broken and the devs making a boss that can't be beaten.
Vanilla rag was tough but the game was so new there were dumb limitations and ridiculous things you needed gear wise to complete it. But Mechanically speaking the Firelands rag fight was harder to execute imo.
I once got in a run with a top 30 world guild (I knew someone, wasn't really that good lol) that cleared H Firelands weekly and they still wiped once before beating it again. The whole group just had to move perfectly.
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