Meanest Guest: that applies to the 1st DS, but not to the 2nd. In the battle of Endor, the Rebellion disposed of its fleet, but had nonetheless to send in the Falcon along with some starfighters, after the shield generator was disabled by the commando squad on the planet surface. This meaning that the whole Rebel fleet couldn't have destroyed an unshielded DS.
OrganisedChaos: what the Imperial fleet has been doing in that battle is still a mistery to me, since it could have wiped out the Rebel fleet in a jiffy.
Possibly, they all were too shocked for the loss of their beloved leader(s), or the very destruction of what they thought invincible drove them crazy with anguish and despair, thus being unable to carry on an effective attack on the Rebel fleet.
anyways, DS owns j00 all! :]
leaving this OT subject, i still think the DS is bigger than the SF.