I use flouro tippet exclusively for trout both wet and dry. I use a 5' Furled thread leader, changing only the tippet to match flies and conditions. I vary from 3-6ft of 5x-7x tippet for most of my fishing. I have seen flouro outfish mono on many a day....but never have seen it the opposite. The only thing I use mono for is warmwater, and I use a tapered mono leader as well.