My smoothest openers are ball locks, with the P'kal being the smoothest.
After them, I think it's my beater ZDP Delica. The detents on all my Taichung frame locks (PPT and Techno) and my compression lock models are too overzealous for truly smooth opening, though my new green PM2 is breaking in very nicely.
Thank you. I have the P'Kal. Smooth, for sure.
My PPT isn't smooth for regular opening. Its a beast when flicked, but want something smooth for the conventional way too. My Techno is smooth opening, but its just too small for me.