The 10000 is indeed bigger. It is infact the largest of the casting reel series, so large infact I would say it would be very difficult to cast. It would have a capacity of approx 300 yds of 30 lb line and as such would be suitable for really heavy rock fishing with lines that heavy. It is probably best used for medium boat fishing.
It has a conventional star drag and has an automatic 2 speed gear system that automatically changes to a lower gear when under load.