Are there saw mills in your area? they can suggest good, selective cut loggers for you. If there are not enough trees to make them (and you) money, they won't come out to your site, unless you pay them. A dozer can take down a large tree in seconds, as sparky said, using the leverage and weight of the tree. Often, a dozer cannot even budge a stump and needs a backhoe or other digger to get it out, at much more time/expense.
ie...a $200 tree may cost you $300 to remove the stump....
