Generally, you should log BOTH dual received and PIC when qualified to do so. Many employers will count it all. For those that want a break down (some airlines), you can simply subtract out the time that was both dual received and PIC.

Dual Given (when you are the CFI) should definately be logged as PIC. Again simply subtract out your dual given from your PIC for those airlines that want it that way.

Even though airlines may want a certain breakdown of your times, they will not have any problem with you logging what's legal and accepted in the industry.