the resolution is better for the SP model, but do you need that accuracy ?
but if you are scanning objects with flat surfaces an not much detail, the SP might be better as the scan table has markers to aid the software to stich scans together,
I have the older S version, and while the software is very good stiching scans together, it sometimes has trouble if the scanned surface has not much detail just flat or curved surface, and you sometimes have to manually let the software know where corresponding point are,
it is not difficult to do, but makes the autoscan feature take longer to do.

The youtube link in the previous post is a great showing of the setup and workings.

If you can afford the 0.05 SP, do it, you can always lower the resolution with scanning/meshing, but not up if you buy the 0.1mm scanner.