My kids modeling my three main bags/cart. All three carry the same set-up so I can remain consistent.
The Delta is for the big rounds like at tournaments, those rounds where I know it is going to be slow. Also, I use it when trying to video - the cart specifically for the phone and the extra storage to lug around the camcorder equipment.
The Revolution Dual Pack are for the league events or big rounds where I know I would be moving faster and or for courses where trying to navigate with the cart will be unwise. Hence the day glow and yellow color of all the discs, to aid in finding them quicker to maintain a higher rate of play. Also, of my three set-ups, the Dual Pack is the only one that can comfortably carry my DSLR. When I know I want to take photos while I play, I will grab this bag.
The Grip is more for the everyday and practice rounds. I am less picky about the colors, but they are all the same molds as the other set-ups. The only time I do not use these for those practice or everyday rounds is when I am specifically trying to get some seasoning in on the other set-ups.
I also have a Focus and NutSac for those even quicker, get-in-get-out kind of rounds. I own an older tournament style bag from DGA, maybe nine or ten years old, that long ago broke a strap from a cheap set of backpack straps. Its main job is to hold all the back-ups I need for quick travel and easy storage. An older Crunch Box is now sitting in my classroom filled with 30+ minis that I use with my Mini-Basket. That Crunch used to be my average day bag, but with the Grip no longer being my main big bag, I have no use for the Crunch for anything else than what it is doing right now.