Termidor SC is said to last longer simply do to research. Termidor has been on the market longer and has proven to last 10 years. Taurus has not been on the market long enough to prove that.
While you can use Termidor SC to treat voids in your subfloor, we would recommend to use Boracare instead because it can be applied to raw wood, be absorbed and last the lifetime of the wood. You can use Termidor SC in your crawl space if there's soil, you can trench around the piers to protect your home.
Termidor SC is not labeled to be used inside except for spot treating active infestations. If applied as a crack and crevice spray inside cabinets it would be recommended to thoroughly clean the area with warm soap and water or an all-purpose surface cleaner.