Best is usually w matter of opinion. That being said, I really like the Rapala knife. It has a 15' or so cable with a cigarette lighter plug in and comes with adapters to plug into a wall outlet or to a boat battery. It also comes with 2 blade sizes.
What I like about it is I can use it anywhere. I usually plug into my truck lighter and fillet on a piece of Teflon on my tailgate. I've been told they're made by mister twister but I don't know.
I've been through several over the years, but I'm not exactly easy on any equipment.
Others I've used work fine, but I like the convenience of the features mentioned
If you can either quickly or quietly switch out shells, you can bring home almost anything.