What Gerald said. Both are great films and capable of more grain or less grain, or more contrast or less based on how it's handled thru exposure, EI, developer used, dilutions, development technique, etc, etc. Some favor one over the other but few who do have taken both to the limits in many situations with many different developers to see the true potential of both. Those that have know that both are capable of terrific results in many circumstances. If I was somehow forced to use one over the other I would not lose sleep over it, I'd just dial it in until I was happy and stick to it.