Switching to a longer knife for feathering changed my game

I mean, I used to just use my standard 6-inch knife for everything, but I started using a 12-inch for feathering out the last coat. It makes the blends so much smoother and cuts down on sanding time. Idk, maybe it's obvious, but it was a game changer for me. Do you all have a go-to knife for finishing work?