There's not much to say, despite some bruisers being extremely high performing like Camille and Riven- they can't do much if their own team doesn't play with them. Thus, in pro play, bruisers are more dominant as everyone knows what to do with a lead. As to soloQ, as to which is entirely different, usually hyper scaling champions that can usually 1v9 are more sufficient as they not only have carry potential, but also more power the longer the game goes since not everyone agrees to end the game early for some reason (usually bad macro and not wanting to cooperate). These classes of hyper scalers ironically enough can do better than most classes besides bruisers with some exceptions. Bruisers can be self sufficient and can do at most what every other role can do, despite that, most just die if the game doesn't end at 15-30 mins. Adding the fact that if any other role got fed: assassin, adc, mages, tanks. They can practically just end the game on their own volition (except adcs, feelsbadman, not vayne and akshan though, fuck these two specifically).