The second is that few discs are better and you pick the right throw for the shot. The third is like the second, but with a hitch. Keep about 4-5 types of discs in your bag but have 2 or 3 of each type with different labels of stability. That said, realize that the variation in discs may be bigger than you think. The weight between 160 and 175 grams can be important.
Weight affects wind, stability, and distance.
More weight does not equal more distance however. Less is normally better for distance, but not if stability suffers. 150 gram discs are nice and worth trying. However, despite what you may see in the packaging, I have yet to see a 150 class tournament. As a humor note, I don't use the Roller to roll, I use it to putt.