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migrating OS also means you're migrating broken files, malware, viruses etc too. A fresh os reinstall is alway the best and safest your machine will ever be, its downhill from there. to save the hassles involved especially when a drive fails is to use separate physical drives for the Operating System (a fast SSD) then install ALL your programs onto a second drive (larger SSD preferred) and have at least one or two other HDD for working data. That way an OS reinstall doesnt mean wiping data and some apps will remaining working where they are but the separate program drive means you know what needs to be reinstalled over the top for registry entries etc to be made to the new os. Also a good practice here is to store config files with the programs not in %appdata% so again you often are back and running with those configurations and preferences that took you six months to optimise.
but if you can't build a pc yourself basically its not safe or even easy to migrate and existing os to new (differing) hardware. it can work out short term while recovering a dead machine but its not suitable for actual use.
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