TCP stack speed is critical with unencrypted FTP and other simple transfers.
Good bechmark of plain TCP stack is TCPSpeed. Unfortunatelly I have no computer with wlan.
I can only test both systems on 100 MbE Pegasos 2, but it has no sense, because both systems result here is cca 90 Mbps - i.e. NIC cannot do more.
Unfortunatelly AmigaOS have no driver for 1 GbE on Pegasos, MorphOS has here 209 Mbps.
Maybe Sam460 or X5000 owners can check that.
AmigaOS3: Amiga 1200
AmigaOS4: Micro A1-C, AmigaOne XE, Pegasos II, Sam440ep, Sam440ep-flex, AmigaOneX1000
MorphOS: Efika 5200b, Pegasos I, Pegasos II, Powerbook G4, Mac Mini, iMac G5, Powermac G5 Quad