What are some alternatives?
When comparing WinISO and PowerISO, you can also consider the following products
ImgBurn - What in the Heck is IMG Burn? We all need to copy discs from time to time.
UltraISO - CD image files are easily created with UltraISO.
MagicISO - MagicISO is a powerful CD/DVD image file creating/editing/extracting tool.
Virtual CloneDrive - Virtual CloneDrive works and behaves just like a physical CD/DVD/Blu-ray drive, although it only exists virtually.
xorriso - xorriso is a command-line (+Frontend) ISO 9660 editor, formatter and burner for CD, DVD, an BD.
CDBurnerXP - Free CD, DVD, ISO, HD-DVD and Blu-Ray burning software with multi-language interface. Everyone, even companies, can use it for free.