From a biblical perspective, no. Existing in eternal torment isn’t necessarily better than not existing. “But woe to that man (Judas) who betrays the Son of Man! It would be better for him if he had not been born.” (Matthew 26:24) the only reason Jesus would say this is if Judas is in a state of torment. He is basically saying that it is better he did not exist.
From simply a theistic perspective, I don’t think you can argue what is better or worse without a real understanding of God (goodness).
God is perfect infinite existence. So not only is existence good, it is love, justice, mercy, truth, etc. Evil is a deprivation within something that exists. Perfect evil would be perfect deprivation, and therefore complete non-existence. So an evil God cannot exist.
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