I'm not sure that it is correct to say WinPE is better than Linux. It's a personal thing and some will find that, although it is more limited, the Linux rescue media's simplicity makes it a preferable option. Having said that, like with the Macrium Reflect program itself, the user can pick and choose facilities within WinPE and use just a few initially for basic backup imaging, until experience and increased confidence encourage exploring and using the facilities more widely.
However, if the user wishes to use the latest version of the program, as has already been stated in other posts, the Linux rescue media is no longer an option so he or she must create the WinPE rescue media in order to boot the computer, should Windows fail to boot, in order to gain access to the backup image files and restore the system.
When I updated Macrium Reflect to version 6, I had a problem downloading the WinPE files but this was resolved by uninstalling the Macrium Reflect program and reinstalling it and completing the WinPE download in Safe Mode (with internet access). After that everything went smoothly and I am pleased I updated. I can vouch that version 6 can use older backup images. I tested the WinPE rescue CD created with version 6 on my Windows 7 desktop on my non-internet connected XP desktop - it booted the system, found the version 5 backup image files on the external drive and successfully restored the system.
Unfortunately, for users who prefer the Linux rescue media, as Macrium, so far at least, seem to have no intention of bringing back the Linux option, it will be necessary to return to version 5 to use their preference.