TypeHow it opensBest forDownside
Rotary (top-cut)Wheel rolls the rim open with light forceThe default drawer openerCut edge is sharp
Rotary (side-cut)Cuts the seam sideways: smooth edge, lid re-sitsHouseholds with kids; saving half a canA little slower, costs a bit more
Claw typeLever-and-stab, one notch at a timeBackup and camping kits, tiny budgetsTechnique required; jagged edge
ElectricMotor does the full lap hands-freeWeak grip or arthritisBulky and battery-dependent for a rare job