Hey Dennis, the swivel and snap serve a couple purposes and in my experience should always be used. First, the swivel: the main purpose of the swivel is to allow the leader and lure to rotate freely. This will prevent the main line, leader and lure from twisting up and running foul. I prefer a good heavy duty ball bearing swivel. The snap is really for ease of use when changing out lures. If you tie directly to the lure, you will have to re-tie every time you do a lure switch out. Regarding Titanium, I haven’t really heard good things about using it. I prefer Fluorocarbon, usually 80-100lb when fishing for ESOX species. Fluorocarbon has a neutral buoyancy, light passes through it, and is extremely strong. Regarding fishing knots, I like using the Palomar, Clinch knot, or improved Clinch knot. Both are very strong and reliable if tied correctly. Hope this helps. Good luck! Tim