Which one is best design software in Mechanical field
SolidWorks is widely used in the world. Its quite user friendly and easy to learn. Inventor, SolidEdge etc are very much similar to solidworks.
CATIA, ProE are quite advanced and they shall be much customized based on the customers requirements, processes etc.
For beginners, solidworks, inventor etc are recommended.
I think we have as many opinions as there are CAD users .
In purely mechanical field all the main CAD softwares are rather equal. They all do well in mechanical design.
I think the price of the software is one of the most important features if you're looking a CAD for mechanical design only. Solid Edge, Solidworks and Inventor are probably the best choices. CATIA/PTC/NX are just overkill for that purpose, not that they would be any worse. I've used CATIA V5, Inventor, AutoCAD, Solid Edge and NX so I comment with experience of them only.
I think we should not tell any particular software is the best.
Each software is unique in its own way and each of them is the best in that perspective...
instead of searching for the best software and then learning that, you could learn any popular software, practise it regularly and become familiar with that s/w.
Then you start comparing the commands in the s/w you learnt with the other s/w. you could definitely realise the thing that i have told before...