I gotta say Disney sea is awesome!! I went there this past may and it was absoulutely great! you can't beat Disney for theme park quality, service and attractions. THey may not be the most thrill seeking rides but they do have some great notable rides such as the "Twilight zone tower of terror" and "Journey to the centre of the earth". As far as USJ I would have to say it is in comparable to disney quality. I been to both USJ and Universal hollywood and they just lack the atmosphere and service the disney brand brings. So yeah if you are in for thrills I say go Fuji Q but if you want a nice theme park head to Disney Sea or Tokyo Disneyland.
Hope this helps
By the way , you can say this if you want to get an english brochure when you are there. Just ask a cast member
Eigo burocha onegaishimasu (English brochure please) Its what I said and it seemed to work ahah.