TypeHow it cutsBest forDownside
Manual, top-cut (classic)Cuts the lid topCheapest, everyday — the defaultLeaves a sharp edge
Manual, side-cut (safety)Slices the side seamSmooth edges, liftable lidsCosts a little more
Electric countertopMotor-driven wheelWeak grip, high volumeBulky; needs power; one job
Multi-tool / hook openerManual, packableCamping, emergency drawerSlow and fiddly