I heard that CC and DD processing times are the same (People with banking background please advice); One thing is for sure, DD is much more secure, it is "money in the bank" sort of speak so it is not a big deal if it is not encashed at the same moment of the review (depends on the reviewer). if you look at the sheet updated by our friend Westpoint, you will notice that only 10% of the reported encashements are DDs.
CC, on the other hand, are more risky as the money could be available in the bank today but not necessarily tomorrow (no balance in the account or account frozen for any reason, the issuing bank may not honor the payment as they might think it is a stolen CC especially that the payment is taking place in a different country...)
I hope this gives you some peace of mind, we all need it