We have seen a few discussions asking for the best straight driver or the best anhyzer disc or the best roller disc, etc.
Of course the answer is : it depends on who is throwing it. An understable disc in my hands might be overstable in yours. A disc which was overstable for you last year might be a straight flier as your power improves. A disc which is worthless to me might be perfect to you.
Now that candy plastic is common in the market a disc basically lasts until you lose it. Even if a disc sat in a box or a car trunk or outside for months or years it will still fly the same and keep the same flight characteristics for years of use.
So if I were in the market for a disc to fit in a particular spot in the bag...And it I wasn't sponsored and therefore able to walk in the factory and try whatever I wished...rather than buy new discs hoping for the perfect fit... I would host a Disc Trading Party.
The average frisbee golf addict has a bunch of discs gathering dust, including, probably, you. If you got together with a few of your buddies you might acquire some hidden/abandoned gems.