I have both kinds. Got my first electric can opener a few years ago and I really like it. Cuts from the side, so no sharp edges. I sometimes use it to open pop tops too, to get the smooth edge. You can put the lid back on if you need to store in the fridge for a few days. I also have an old-fashioned church key opener for certain items where it’s the best option for easy pouring. Liquids in cans with non-pop-top lids, eg. evaporated milk and pineapple juice come to mind.