[mgmueller]

I'm resetting all 3 in parallel.
I want to have a clean install.

Of course this simple comparison is far from being a real benchmarking exercise.
How to compare Windows RT to Windows 8?
But I guess, it still says something...
For example, Dell Latitude doesn't have SSD but eMMC. This may explain the long duration for a new install...

After 8 minutes:
Surface Pro : 10%
Surface RT: 12%
Dell Latitude 10: 2%

After 13 minutes:
Surface Pro : 26%
Surface RT: 71%
Dell Latitude 10: 4%

After 17 minutes:
Surface Pro : 39%
Surface RT: DONE
Dell Latitude 10: 5%

After 28 minutes:
Surface Pro : DONE
Surface RT: DONE
Dell Latitude 10: 11%

After 161 (!!) minutes:
Surface Pro : DONE
Surface RT: DONE
Dell Latitude 10: DONE

I guess, the comparison with Surface RT is rather meaningless.
Probably way less data to reset?
But Surface Pro and Dell Latitude 10, both Windows 8 systems (albeit i5 vs. Atom processor), can be somewhat compared.