It really depends on how you like to camp . Some like FHU's, some like a more remote CG. I found the CG's inside the park very crowded with small sites and hard to get without reservations. Stayed in the NFS CG's in west Yellowstone, sites were larger, less crowded and no problem getting into. Woke up one morning to buffalo sleeping in our camp site, saw a grizzly chasing a mother and baby moose into the river. Short drive with the tow car into the park. GS and I hiked into the park from our campsite along the river and fished in park, never saw another person.