WinFE is Windows based, not Linux. For someone not experienced in Linux, the Windows environment may be easier to use due to familiarity with Windows.
Additionally, WinFE allows you to use your Windows based forensic applications in a forensically booted environment. Rather than using a Linux CD and image with Linen, you can use a Windows CD and image with the full version of Encase or FTK Imager or X-Ways Forensics or other Windows based tool.
If your lab is Linux based, then WinFE may not be as comfortable as using a Linux based tool, but still may be an option to keep on hand (the opposite still remains true, if you focus on using Windows based tools, have some Linux options on hand as well).
Lastly, WinFE is updated by YOU, when YOU need it updated. There is no need to wait for a distro to be upgraded every 6 months or longer before you can download it. Current Linux ISO's available online still may have older versions of software that are outdated. With WinFE, if any tool is updated/upgraded, you can do it immediately and always have the latest apps.
Other than that, its just user preference.