[SilverTalon]

I would say Accel would lose (though that is assuming you mean Goku at his max and not say DB Goku). My reason is

Spoiler for Light Novel 22 Spoiler:

There does seem to be a max to the amount of power he can reflect. Sweep couldn't be entirely blocked with is powers. The blast only small enough to blow up Eurasia knocked white winged Accel out, but by the end of DBZ they are tossing out attacks probably a thousand times, maybe even a million times, more powerful (considering Roshi in dragon ball blew up the moon). I'm also skeptical that Accel's attacks could harm Goku if you consider that Goku also tanks attacks that far, far exceed what would blow up the planet