As long as PureOS does not work with UEFI you’ll probably not get PureOS to work on your Surface, and having to use all those no free drivers to get all the parts to work it’ll no longer be PureOS anyway so you could just as well use Debian with Gnome then you have PureOS without beeing pure. Since all the low level Security Features that PureOS brings out of the box only work on Purism Hardware.
There should be no difference.
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