727 vs 904

from my understanding it depends on your hp and weight of your car..i think it was mild hp and light car yes 904 but high hp heavy car 727 then at some point in hp 727 hands down....i have talked to alot of trans guys and verta guys that say the same thing....the best way is to put 904 low gear in 727 and keep the stronger case...just what i have heard ...i also had plans for a 904 but think ill keep the 727 and get the 8'' verta.......but thats just my 2cent...