FCHR - You would use only if you are interested to clear the cheques. Hence, no bank reconciliation is possible (Note, your bank statement does contain not only cheque payment, but various incoming payments and outgoing payments)
FF67 - If you want to do bank reconciliation manually, then you use FF67, you can also use FF.5 or FF_5, if you are looking for electronic way of reconciliation.
FF68 - This is for manually entering cheque deposit transactions for the customers.