The blocking network line is the aluminium foil that shields the network cable, so STP and FTP are actually the same, hence SSTP ,SFTP. http://www.trangjan.com/de...
S/STP - Overall shielding by wire braiding + wire braiding over pairs of wires.
F/STP - Foil shielding for all cores + wire braiding for individual cores
FTP - General foil shielding
S-FTP - Overall shielding of foil or wire braid or both together
In my opinion S/STP better because wire braiding.