I have both and I like both of them.
However they are very different knives.
the PM2 is my "factory knife", robust and confortable in hand while still slim enougth to stay in your jeans without beeing too massive or heavy.
By comparaison the ZT0550 feels like a brick in your pocket, the blade is thicker which make is a poor slicer compared to the PM2.
But when it come to outdoor activities I enjoy the ZT0550 more.
The ergonomics are good for me when I need to put some real strenght on the knife, the locking mecanism and the operation of the knife are simple, robust and reliable...
Two different kind of knife.
You shall choose accordin what you would like to use your kife for.
IMHO the PM2 is a very good allrounder, while the ZT0550 ... well I like it, that is that simple
