Originally Posted by Fly Me To The Moon

From my comparison of the Fare Rules, here is what i see to be the main similarities and differences:

Cancellation of unused ticket: both allowed, at a charge of TWD 2,000 for BSav and TWD 1,200 for BStan.
Cancellation of partially used ticket: not allowed for BSav, and at a charge of TWD 1,200 for BStan.
Changes to inbound and/or outbound travel dates: both BSav and BStan allowed with no handling charge (as long as that fare is available)
BSav has more restrictions on allowable travel dates
BSav has 1-month validity for the inbound, and BStan has 3-month validity