With this method (Option+Command+R), do you lose your User data? I presume I would not be offered Mojave, as I do not have a Metal-compatible graphics card.
The only ways you might lose your data would be an SSD failure or you launch Disk Utility from the Recovery drive and erase the SSD. This would be true of ⌘R, ⌥⌘R, and ⇧⌥⌘R re-installations. However, you might find your SSD changed from HFS+ to APFS in cases where that is a normal part of the installation process.
I have done several ⌘R re-installs and have yet to lose any data.
