PBFT and PoET are two most consensus algorithms supported by the Hyperledger Sawtooth platform.
PBFT:
It is a leader-based Hyperledger consensus mechanism which is non-forking and offers Byzantine Fault Tolerance (BFT). Since this algorithm is ideal for smaller consortium networks, it does not need open membership.
PoET:
PoET stands for Proof of Elapsed Time. It supports large distributed validator networks with the least resource consumption. You don’t need hardware to run PoET or Sawtooth.