I suppose its time I came about to expressing how things work in the world to you lovely people.
Movie 10 Broly alone would probably be more than a threat as I already have him distinctively above SSj2 Goku. Not by a lot but by a notable amount and I may even argue that the gap could be larger. With that in mind, whether or not Broly faces Gohan or Goku, he's ultimately going to win.
Obviously easier time with Gohan than Goku in such a case.
For Cell, it's made pretty damn clear he's rivaling Gohan in power. The sheer damage he put on him with one attack accompanied by the fact that Gohan needs to use his full power on a distracted Cell really sets to standards that Cell is no pushover. If anything, in a direct fight, Cell's overall superior combat ability, regeneration, Instaneous Movement and just being shit load better than Gohan at everything but amp I suppose really gives him the overall edge.
Both of them, regardless of who wins will honestly be too beaten up and out of ki to really do all that much in the end and if Gohan wins he's facing Broly and he's winning because even accounting to whatever damage the lumbering freak nugget has taken, won't be anywhere as bad as Gohan has taken trying to beat the God of Arm Breaking Chi Blasts Cell.
And let's just say Cell wins...honestly he's not going to be doing too much in his state but that's still not looking good on Goku's part.
In the end Broly's team takes it. For one their side just as the more powerful person on him. Whether he faces Goku or Gohan he's going to win with specific amount of difficulties on each one. We can change it up, let's say Broly fights Gohan and Goku fights Cell.
Cell's going to lose. I put it around similar to a Goku (Kaioken X2) vs Saiyan Arc Vegeta, give or take a little. Cell might hold his own defensively for a while, may land a few hits here and there but its clear who'd ultimately have the advantage.
So with Cell down and Goku taking, moderate damage I suppose, he's going to face Broly who has hence forth put Gohan through the grinders. If I have Broly signcantly enough above Goku and there's at least a notable gap betwen Gohan and Goku, then obviously Gohan's not going to be doing too well against the Iron Saiyan.
In the end, it runs down to our favorite meme ridden Saiyan and Masterful Artful Goku with winning to hilariously gigantic steroid user.
Brofist has spoken