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You can use Roar of Time to inflict 150 damage and risk being damaged in return, or take the opportunity to use Spacial Rend twice for 200 damage, plus a higher chance to score critical hits. The choice here is quite obvious.
Special Rend because It has a higher chance of critical hit plus no recharge, Roar of Time has to recharge even though it's only 50 stronger than Special Rend