In today's world, which one is the best Structural Design and Analysis Software we use most frequently for big constructions?

It depends on what the industry required. As in STC (Saudi Telecom) and ZAIN-Nokia, they specified that the approved structural engineering software is STAAD Pro for buildings and GuyMaster V1.20 for towers. For connections such as post chemical anchors, welded baseplates and stiffened beam seats, they specified Excel programs.Others will specified ETABS, SAP2000, Tekla, Revit, MAST, RISA, etc.

As for me, I like the STAAD Pro v8i because it is user friendly.

According to my opinion STAAD AND TEKLA!!

According to me STTAD PRO and TECHLA are best software for construction design point of view but we should not relay on only software results its necessary to go for design hand calculations according  to ASME standards and finally matched both the results to know the percenatge of  deviation in the error, based on these error they can take step to modify the design

Well for me its a mix of Staad Pro, Etabs and SAP. Depends on the type of structure we are going for. Steel goes great with Staad whereas Concrete structures with extensive meshing will go good with ETABs. Hydro projects go with SAP. So its a kind of a mix for me

I think STAAD Pro, Revit and Tekla - These are best options.

RFEM has been my choice for the past year.  WAY more intuitive to both model and understand your results compared to several other programs I've used in the past.  

The most software used are STAAD Pro and Robot Structural Analysis but still that the use of software depends on the design office preference and the region of the project.

SAP2000 IS Good can use abacus in typical structure for Fem ,

            There are many softwares being used today for structural designing. But as a structural designer, we must not put our full confidence on the software we are using. As a professional, we must know wether the output the software gives us is correct or not. In short, we designers must know the process of design where in we can be sure of the results we will be giving our clients.