I like to try them first. They need to fit my hand. I've tried the Martelli ones and not bonded with it. My favorite for now is the Olfa 60mm. Slide the blade to cut. Slide the blade to close. I always-always close it after cutting. I have one of the squeeze ones too. I don't want to have to hold it to keep it open while cutting. It is safer though. No squeeze-No cut!
I would like to try the Quilters Select to see how they fit my hand. Good luck!