I am not going to suggest what is is better, but it you like Vanish leader, then buy the Vanish filler spool will definitely save you some buck. Seaguar line will be a bit tricky, they make a few different fluoro formula, you need to find out which leader you like then buy the same formula in the big spool. Some company only want to appreal to steelhead market only and they sell big spool, like Drennan, Raven, Red wind, Frog hair are all good leader material, they can sell the same line in a big spool and you all can save more money, but why would they? they are making good buck. If you are looking for 6 lb test leader, there are lots available in a filler spool in the market, berkley 100% fluorocarbon, P line fluorocarbon (not fluoroclear), BPS XPS fluorocarbon are all available in filler spool size.