Either one will work fine if installed properly. Split unit will require enough height in the crawl space. If house is two story a split works better. A package unit is better to service. Short gas line, no venting problem and no freon lines ( Less chance of leaks). Sometimes a problem in getting the right size return in the crawl space. Large outside unit might be a site problem?
I would consider the length or your duct runs in this decision. With a split system you can usally locate your inside unit (furnace/air handler) in a more central location which shortens your duct runs. It just depends on the lay out of you home. If you have a package unit at one end of a long house and a room with a big heating or cooling load at the other end of the house you may run into problems getting enough air flow to that room.