I'm thinking about migrating from Windows 7 Ultimate 64 bit to Windows 10 Pro 64 bit.

I believe I have 2 options available to me.

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> * Do a clean install of Windows 7 Ultimate 64 bit with retail key, then do an upgrade to Windows 10 Pro 64 bit.
> * Do a Windows 10 Pro 64 bit install using the above retail key.
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> 
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Between the two options above: which process would be the better option of the two or does it not make any difference?

Before a decision is made to give an answer to the question above take into consideration the following:

I plan to wipe my hard drive completely meaning that I do not intend to just delete the partition or format the drive. I plan on using a boot-able disk image partition program to erase the drive fully (write all 0s). Then I want to install Windows 10. I plan on shifting from the standard bios of Windows NTSC to EUFI type bios and partition types if possible.

Once my hard drive is wiped clean and I begin to install Windows 10 I want to know which of the above approaches is better for a good solid clean build of Windows 10. Install Windows 7 first then upgrade? Or Install Windows 10 directly using the Windows 7 retail key? Or what is the correct procedure before I decide to begin the process of wiping my drive?

If you need more information about my current hardware do not hesitate to ask and I will provide it if needed.