What is the advantage to buying a P6982 probe instead of a P6980 probe?

The P6982 is exactly the same as the P6980 except that it has only one 17-ch probe head so the total number of channels is 17 instead of 34. A customer would order the P6982 if they are only using quarter or half channels for (4x or 2x clocking). In these modes the other 17-ch probe head would not be used so for that customer it is a less expensive probe option.