GPMG Firing Comparison: PKM vs UK vz.59

Since I had the opportunity to do some shooting with both a Yugoslav PKM and a Czech vz.59 general-purpose machine gun, I thought it would be interesting to compare them side by side. Which is better as a proper machine gun? And, to make things interesting, which is better as a semiauto-only firearm, as they are both available in the US?

Thanks to Marstar for letting me examine and shoot their M84 PKM and UK vz.59!