The triangulated systems are NOT afternoon bolt-in jobs. The short upper bars on the triangulated systems and the amount of adjustment on both upper and lower bars limit their HP level.
My guess is the HP limitations of both are about the same. The next level would be back-halfing the car.
I guess you've never seen any of the many Fox Body Mustangs racing all over the country, be it Drag Radial or NMRA Hot Street or NMCA Pro Stock etc.... Fox Body Mustangs came from the factory with a triangulated style rear suspension. A good "stock suspension" Mustang is capable of 60 footing in the high 1-teens - low 1.20's & handle 1500-1600 hp as a guess? I'm not sure the exact HP the drag radial guys are running, but a few have gone around 7.40's at about 3400 lbs.
