I'd like Trunks just due to it being so long since we last saw him and Gohan has had chances to shine in Z, but I'd be fine with either or both would be awesome, like if Trunks and Gohan started training together, and Trunks helps Gohan get back into his stride like Future Gohan did for him and even has some flashbacks or something like to the time F-Gohan told him he just had to find the right kind of motivation to get stronger.
Like cdtm said though, Vegeta stated Gohan had the most potential, and it's always kickass to see Gohan hit untold levels, so he'd definitely be interesting if he reaches that point.
Originally posted by Ridley_Prime
Gohan can stay in his glasses and ghey little track suit. Trunks is the only one from his timeline still around to defend it and thus needs to remain a badass.
Got SSJ 3 level power on his own. No afterlife hacks, no cheap powerups, no "Kaioshin gay dance" help. And he even switched out that pink hair.
So he's pretty much the most badass Saiyan by default now. He may not be the strongest, but he's a self made man for sure.