Hi lemonpie, the length of your leader and tippet depends on the stuation you find yourself in. Sometimes 9ft is fine, other times 20ft is needed.
Poly leaders are a tapered leader available in variuos lengths and sink rates from floating to very fast sinking, they alow you to fish at different depths without changing your fly line, you simply change the poly leader to suit. You just loop one on, tie on a tippet from 2ft to whatever you need and away you go. If you use a 10ft poly leader you should be able to turn over 10ft of tippet fairly easily, giving you 20ft between the end of your fly line and the fly.
Furled leaders are just that, Mono or thread is furled to make a tapered leader that really turns over the tippet well and can be cast with just the furled bit out of the rod tip if needed.
Hope this helps.
All the best.
Mike
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