Before installing Macrium Reflect V8 I had created an Windows 10 recovery disk on USB thumb drive. Have also now created a Reflect Rescue Media on USB thumb drive as well.
Excuse the newbie question on the Reflect Rescue Media. When it comes to a possible restore of my secondary drive, or a particular file or folder. I know how to browse / explore and accomplish that function.
But want some clarification on worst case scenario, if my C: drive (the OS drive) crashes. Would my best restore option be to use the "Reflect Rescue Media", and not the "Win.10 recovery disk" ?
With the ultimate goal of getting my OS up and running, with preferences and settings as before, and all my personal data intact !
Will "Reflect Rescue Media" reinstall Windows 10 OS & data, without the need of the Win.10 recovery disk, and make my new drive C: bootable once again?
In my above scenario I'm referring to a complete hard drive failure, not some type of corruption of the Windows operating system. Which then I'd probably would use the Win.10 recovery disk to get into some repair or reinstall situation of OS.
Thank you, Bill

If you have made image backups of your system, and they are current (made daily with full, incremental or differential backups) then the Reflect rescue media will allow you to restore your C (Windows) drive back to the condition it was in when the backup was made. It is assumed that the system was working at that point. In fact you can restore your whole system if need be.  (Note: many people do not install addon software (anything other than Windows) to the Windows drive to prevent loss of data or other parameters if the Windows drive has to be restored to a previous state).   Also, you can use the "fix boot issues" feature of the rescue media to fix problems related to the booting of Windows, should that be necessary.  

The Windows Recovery tools and Reflect Rescue Media share the overarching goal of allowing you to “recover” your system, but they are completely different in terms of their capabilities and mechanisms.

As Drac says, Rescue Media allows you to boot into an environment that allows you to run Reflect, from which you can restore Reflect backups — or make Reflect backups. Sometimes there are good reasons to do that, even if your system isn’t currently bootable. But if you don’t need to make backups and don’t have any backups to restore, then Rescue Media won’t do a whole lot for you. Yes there’s the Fix Boot Problems wizard and you can access a Command Prompt, but the former isn’t a panacea, and the latter isn’t unique to Rescue Media and is only helpful if you know your way around Command Prompt.

By comparison, the Windows Recovery environment includes some capabilities that tap into Windows-native functions. For example, you can run System Restore, which (in theory, when it works) allows you to roll back system changes WITHOUT rolling back personal data changes. Reflect’s image restore operation always restores an entire partition, so unless you keep all of your personal data on a separate partition and choose to restore only the OS partition, you can’t quite achieve that end result with Reflect. Windows Rescue also allows you to uninstall a Windows update that might have rendered your system unbootable, again without rolling back personal data. Reflect can’t do that either. On the other hand, if your Windows environment is completely trashed, then these tools won’t be usable either, because System Restore and “Windows Update uninstall” both rely on the Windows environment still being serviceable. Reflect Rescue Media has no such requirement. As long as you have a valid image backup of the necessary partitions, you can restore onto a disk that is completely empty and get a usable system again.

So there is a case to be made that each recovery solution has its uses. That said, if you make frequent image backups with Reflect, the chances that you’ll want to use Windows Recovery are somewhat slim, UNLESS you’re in that camp of needing to roll back your Windows environment without rolling back your data. Again, some people achieve that goal by storing their data on a separate partition. Others just make frequent backups or store content in the cloud. As with many things in life, there are pros and cons to different solutions, and multiple ways to go about things.