Sean Schemmel, easily. Every-time I've had to watch Dragon Ball sub (which is mostly for some Z specials and Super), I've tolerated Masako's as Goku. Maybe see sounds too feminine for an adult Goku, or maybe I'm just to use to Sean Schemmel, but I've never really liked her in the role. As a strange side, from what little I've sampled, I think her performance as Black is excellent, better than Sean's.
Also for Kid Goku I'd go with Stephanie Nadolny over Colleen Clinkenbeard for what it's worth. Won't throw Masako into the equation here since I'm not familiar with subbed Dragon Ball at all.