I am reading several books and have come across that it is better to start with an established comb over the package bees. Is this true?
There is no noticeable difference in starting hives on foundation vs. comb. Possible disease issues aside, drawn comb will give the bees only a few days head start in brood production. However, the drawn comb will not provide that much of an advantage in population buildup through the summer months. There should be enough cells available once a queen is released on foundation to begin laying eggs. The worker population should be just as strong at the end of the season when started on foundation provide they are properly fed. Feeding will make a difference especially for a hive started on foundation or when adding a box above the brood nest.
Honey bees need sugar (nectar and honey) to produce wax for building comb. Bees on foundation require a great deal of sugar to draw out comb for brood production and honey and pollen storage. You should continually feed a 1:1 or 2:1 sugar:water solution to newly installed packages until all, or nearly all, frames of foundation are drawn out to comb. When mixing the sugar syrup consider the weight of water and sugar being used. A gallon of water weighs about 8 pounds. So, 1 pint of water weighs about 1 pound. Use the proper weight of sugar and volume of water to obtain the proper concentration.
Keep in mind also that honey bees prefer natural nectar to sugar water. They may stop feeding on sugar water during a nectar flow. Should the flow stop and frames with foundation remain in the hive you should restart feeding with sugar water. Otherwise, you may see holes chewed in the foundation where the bees are using the wax to cap over brood cells. If you use frames with drawn comb to start a package continue feeding at least until one box is full of brood; and, there is 20 pounds of stored honey in the hive (a full depth frame will hold approximately 7 pounds of honey). This will give the bees a good start to build up through the summer to make it through winter.