Well in my opinion I think 孫 悟空 would win. Unless he was holding back and if Bardock knew he was holding back he would tell him to fight. Full Power without going super saiyan.
Bardock, probably. He was the 'Legendary' Super Saiyan, not Broly... So, 孫 悟空 would have some trouble against him, I would imagine. Then again, we can't discount Goku's SSJ4 transformation, または his SSJ3 one, either. The time for when this kinda battle would happen and which form 孫 悟空 was in really needs to be defined here.
孫 悟空 would win.Goku gave frieza a hard time as for bardock he ロスト in one hit.I dont kno why people keep saying bardock wil win.Bardock has a power level of 10,000.He couldnot even beat vegeta in saiyan saga