This all depends on the volume of oil, the pattern, the bowler, and the ball layout and surface. However, you can rest assured that Brunswick's numbers are correct. The Inferno is a "stronger" ball than the Bruiser, and both are "stronger" balls than the groove series. If you throw either a Bruiser or Inferno on a shot/pattern that causes them to lose energy early (i.e. broken down, spotty, drying heads) then the ability of the Groove's high RG core and milder reactive cover to get it down the lane, conserving energy, will provide "more hook", making you think it is more ball. The RIGHT BALL ON THE RIGHT SHOT is they key. I've bowled with high average scratch bowlers who complain that their Inferno or Ultimate Inferno is not hooking ("must be some carrydown:"), and they just don't realize that their ball is too strong for the front and early midlane condition, thus losing energy (burning up). They never noticed that I'm getting  backend and scoring with a shiny Red/Black Monster, which is milder than most balls on the market today (pearl PK17).
The Bruiser comes polished - the Groove comes sanded. Totally different balls for different purposes. To answer the original question, given the same surface on both balls, the Groove would go longer than the Bruiser. If you polished them both equally, the Groove would go longer, and the backend would depend on the layout and lane surface. The Bruiser is probably a more "all-around" medium condition bench-mark ball. The Groove would be either a good "first reactive ball" for a bowler moving up, or a real good specialty ball to put in an arsenal. You can do a lot of surface tweeks to a solid PK17 cover, and the core design will get it down the lane on just about any condition short of a desert.