I think it's important to note some pros and cons:
Track Prossafe, regulated, no road debris, no 4pacs of cops
Track Conscost, lots of wear and tear on brakes, tires, and other parts
Canyon Proscheap, fun as hell

, always available
Canyon Cons85 in a 40 is frowned upon

, unforseeable road hazards, traffic, motorhomes, old farts in blue corvettes driving under the posted speed limits
I'm sure I missed some pros and cons. Feel free to add. I'm going to think a while before I vote.