I have two rods with braid on them (thus requiring, at least for my OCD, a flouro leader) and one has a swivel one has a knot. I notice no significant difference between the two. If anything I like that I can easily reel the knot through the guides. This allows me to use a longer leader so it lasts longer before I need more flouro. I have noticed I get some minimal spin with certain baits but I catch fish the same on both outfits with those baits.