jd:
Tire shine is a subjective thing; some like the shiny tire because it gives the appearance of a cleaned/detailed car.
Me, I like the more natural -matte finish- look; like what came off the assembly line when the car was new.
Anyway, your concern is with tire shine sling. I would think that if you've had good experience with Optimum's Optibond that you would stick with that, but I understand that every good detailer is looking for something better/different/less expensive. Since I cannot comment on the two tire shine products per your request because of no experience with them, I WILL suggest Meguiar's Endurance Tire Gel, IF you like shiner tires without the sling. It still needs to be wiped off to some degree,but that initial "shine" is OK without being too "plastic-like" and after a few rains/car washes, it still looks shiny. Plus it's available over-the-counter (Read from the ever-present Wal-Mart) and inexpensive (read "Cheap").
A side note about tire dressings is that IF its left on with a wet-look (IE, not wiped off), it will attract dirt/dust/debris. Right now in Wisconsin, the cottonwood trees start to develop this cotton-like seed "fuzz" that is gets everywhere. I HATE it when tires end up looking like grey-beards or Q-tips from the fuzz that sticks to wet tire dressing that blows around after sitting outside under or near one of these trees, (which is why I prefer a natural matte finish and wipe off the tire dressing as much as I can).