I have been using RIO leaders and Frog's Hair fluoro tippet joined together with a surgeons knot (or double surgeon) for years with very few problems. It is a quick tie for me and it's the knot I use the best.
The key is to wet all the lines and pull evenly on all 4 strands to get a proper knot. The knot strength is somewhere around 95% line strength IF tied correctly.
Another tip is to always test the knot by pulling on it before letting a fish strip half your rig off
It's always great to learn new knots and experiment to find what works for you. I know many "guides" will only use a blood knot in this situation.