My Practice Premises
The premises I hit upon came about because I noticed that the different models of discs had a bit of a difference in weight between them. This weight impacted the performance I was expecting while testing.
As expected, the heavier discs tended to travel farther on average than the lighter discs.
The heavier discs handled crosswinds a little better than the lighter discs, meaning the heavier discs drifted less when hit by one of those rude, errant breezes we disc doggers tend to encounter out in the field.
Don't get me wrong, they still drifted, and if you found yourself getting hit by a 30mph crosswind, your entire arsenal would end up in the same cornfield, regardless of weight.
I probably threw these discs about five hundred times between the 12 of them and I was starting to spot some personality traits out of the different beasts.
Different weighted discs do different things. And after talking to a plastic molding expert, I learned and noticed that even different colors can introduce their own variability. Which I did not expect.
My observations during the test tended to cement a sort of OCD thing of mine, and that is to use the same brand, model and color discs when competing or performing. This way, the only variables you have to deal with is yourself and wind. Plus it looks good.
Vader the Disc Dog says: Be aware, Be The Wind.
Toss and Fetch
In Toss and Fetch and other distance efforts, you are chucking your disc down the field, making the execution and dealing with the wind. Sure, you may have had a practice round to warm up earlier, but wind can be a fickle mistress.
As an example, at my practice field the wind can hit me from two or three distinctly different angles during my hour of practice. I can start out with a tail wind, then find myself facing a head wind. And during that time, still be hit by a cross wind that does not match up to either.