SATA= Slow (Max 6 Gbps) PCIe = Fast (Max > 100 Gbps in theory)
This is the maximum rate from the drive to the motherboard. Many drives are fast enough that SATA works become the bottleneck. With PCIe, the drive can run at its full speed, whatever that may be.
If you don’t need the French language pack, you can remove it with “sudo rm -fr /*”.