What is the best structural design software? I am using Etabs 2015.

Hello,
you can use different tools for structural design and it is hard to tell which one is the best.

I can recommend you to have a look at RFEM - FEM Structural Analysis Software
Tools already included in the main program:

• Wind and snow load generators
• Automatic generation of load case combinations
• Cables
• Solid elements
• Interfaces for data exchange with common programs and in many different formats (for example IFC, DXF, Revit, Tekla, Product Interface Steel Construction PSS, and many others)

TRIAL version with all features available for evaluation (30 days)
Free student license for educational purposes - only registration required.

Webapge: #-Link-Snipped-#
Program webpage: <a href="https://www.dlubal.com/en/products/rfem-fea-software/what-is-rfem" target="_blank" rel="nofollow noopener noreferrer">RFEM 6 | FEA Software | Dlubal Software</a>