TG is fast and highly energetic. It's abundant and popular - not sure which is the cause, and which is the effect there. It's also economical - I guess that's important to some loaders. To me, the propellant is the least expensive of the components and thus, isn't hardly a factor.
TG is at its best making your basic plated range shooters for most calibers. If you're loading to punch a bunch o' holes in paper at the range, then TiteGroup an ideal propellant.
It (TiteGroup) makes accurate low recoil loads for USPSA.
It (TiteGroup) isn't case position sensitive nor is as temperature sensitive as W231.