Some countries allow you to choose between WIRE or ACH (sometmes known as iACH for international transfers). ACH takes from 2 to 5 business days, not including weekends (bank do not operate at weekends)
Wire is quicker, taking 1-3 business days. There is a $10 USD fee for wires from the banks. ACH is free.
If you want to use ACH then select ACH and link your bank. If you want to use WIRE then link your bank using WIRE. If you want to use both, then link your bank twice, once time selecting WIRE and then again using ACH. Then you can then select either when you transfer.