I have screw jaws on my traveler and cam jaws on my presentation. The screw jaws work great as atested to by the number of years they've been around but I do believe the cam jaws are nicer - just easier to get proper tension. On the other hand, I'm not rushing out to upgrade the jaws on the traveler.

Both are great products and you'll be happy with whatever you decide on.

ParaHopper