Here's what I've noticed while playing my barbarian.
When I'm soloing I'd prefer Frenzy, because it beats Bash in damage and can be used to self heal with Triumph rune.
When in a party I'd prefer Bash with Onslaught rune, because with the extra dps in a party it's harder to keep frenzy up; most of the time the fight is over before I could really enjoy the stacked frenzy effect. Maybe if they extended the frenzy effect duration from what it is, like what 4 seconds?
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