IMHO, frang is more/less all the same.
The differences are marketing, packaging, and getting some "pro", former SF guy, etc...to sell it as some miracle round.
The thing with SD rounds is not what they have the potential to do but what they consistently do through a variety of mediums. Heck one time in 10 that frang round might drop a charging 3000 lb rhino right in its tracks, but if it can't do that with regularity, than is that what you want to potentially save your life.
Prefragmented rounds might be fairly effective if you shoot one of those 410 gauge varieties. That round leads with a 30cal conical rd followed by (I think 3 round balls). I've not seen any testing so my thinking it might be effective doesn't mean squat.
If you're worried about other family or neighbors on the other side of thin walls, most pistol rounds, including frang, are gonna go through. As crazy as it might sound a hollow point 5.56/.223 rd penetrates dry wall mediums less than handgun rds. Or a shotgun's first one or two shells loaded with #8-6 birdshot followed up with 00 or 1 buckshot.
Back in the day we did a lot of testing. At the time our primary entry gun was the 9mm MP5 and eventually 40cal MP5. We also had 5.56 rifles as well and around that time, MIL/LE teams started to become concerned of collateral damage/liability issues if we blasted off a rifle in a house/building.
Even with the increased velocity a 55-62 gr bullet losses velocity quickly too. It just takes more to stop the slower 115-230 gr. pistol rd. You'll probably notice subguns aren't carried a whole lot by teams anymore.
The reason frang keeps going is because it doesn't deform like 'normal' bullets. It's either a bullet or it's powder and (within reason) it just keeps going until it either finally looses velocity or hits something hard.
That's been the result of my experience anyway. Take it with a grain of salt.
