Depends on Whose Territory . PKK is fighting govt. of Quite a few countries all at once , meanwhile Taliban has factions ( Good in neighbors border , bad in mine ) .
PKK, they tend to be better armed and better organized. The Taliban are splintered, while the PKK have a central command. The Taliban fight till they die, while the PKK know when to run and fight another day.
Anyways, if they do ever get into a fight, I hope they both get wiped out.