After frequent high dose use which is more dangerous alcohol withdrawal or heroin withdrawal?

Alcohol withdrawal can lead to DT's (electrolyte imbalance) and seizures which can both lead to death. Heroin withdrawal may make a person feel like they are dying; the biggest danger is dehydration, which if left untreated can lead to serious health problems. Severe alcohol withdrawal should be completed in a hospital whereas heroin withdrawal does not necessarily require hospitalization. Severe alcohol withdrawal is more dangerous.