Generic bravado? Vegeta has had no problem admitting inferiority in the past. That's a poor excuse. Vegeta spent six months in the RoSat, while Goku spent 12 hours learning the Mafuba. Prior to that, the two seemed about even during their first trips to the future, so how could they be even on their last trip? Unless you think Goku's strength went up just as much from his 12 hours as Vegeta's did during his 6 months...?
Just watched the clip from the baseball episode. They look dead even man... Goku starts to push it away and Vegeta gets upset and manages to start pushing Goku back... then begins to charge a Final Flash until he was distracted by Yamcha trying to steal 2nd base. Only then does Goku manage to bat the ball downfield.
