E-Visa is applied and received online. You don’t need to submit a passport or any documents. On the other hand, you need to contact the Embassy of Tanzania in your country and submit all required documents to get a Tanzania Visa.
You also have to wait about weeks for having a traditional Visa instead of a few days as e-Visa.
Useful information:
Tanzania Immigration Services
Tanzania e-Visa fees
Tanzania Visa processing time
Check the Tanzania Embassy
Check the Tanzania e-Visa requirements