5. I would like to add one more point is that if client require detailed calculation report, Etabs fails to produce, It produce only summarized reports and not step by step formulation based calculation like manual calculation or excel bases calculation but in Staadpro, there is a option to generate very detailed calculation reports just like manual calculation which is not only formulated but also referred codal provisions .Thus sometimes, it also depend upon client requirements
If you are newly entered in structural design industry, go for Staadpro due to its unmatchable user friendly environment. Staad is very easy to learn and more important is,inputs requirements are very less to complete the design in comparison with Etabs which has lot of Input requirements which might be difficult to understand in initial stage.
2. If you are doing steel structure, undoubtedly Staad is Best due to its easyness in modeling & detailing with economic solution but for RCC structure, result of Etbas are more reliable due to its optimization techniques and detailed optional analysis method.
3. If you are doing small structures like upto G+3 structure(RCC), Staadpro is better to use because results are almost same but easyness will increase in Staadpro .For High rise structures, Etabs gives better result and reliability.
4.If you have time constraints and give the detail design and drawing of structure in hourly targeted,Staadpro along with RCDC gives best solution as it is very fast to produce design,drawing and detailed documention.But if you have ample time to research, Etabs is best due to its various & detailed analysis skill.