Which one is better? IsoDraw and Creo Illustrate

Hi,

I am working as an technical illustrator. I installed some softwares as following.

• Autodesk Inventor
• PTC Creo Parametric
• PTC IsoDraw CADprocess
• CorelDraw
• Windchill
• Arbotext Editor

I have two working process

• Open 3D model in Inventor  > Create 2D drawing as CAD file > Open the drawing in CorelDraw > Modify the drawing and export it to SVG
• Open 3D model in IsoDraw > Create 2D drawing as CGM > Open CGM in CorelDraw > Modify the drawing and export it to SVG

I upload SVG to Windchill one by one.I think it will be easy to use if there is a link between Isodraw and Windchill.

There are two choices for me. IsoDraw and Creo Illustrate. I want to know which one is better.

Thanks.

br, Lily