recommendations for campgrounds in Yellowstone & Glacier National Parks

[whitepine]

We are planning a trip June/July to include Glacier and Yellowstone National Parks. Does anyone have recommendations for the campgrounds within the parks? We've also considered while at Glacier to drive into Canada to Waterton. During our trip home from Chilliwack (after picking up our 21') we stopped at Glacier for 1 night & stay at Many Glacier because it was only one open then. At Yellowstone we have read recommendations fro Canyon Campground but then have also read that it is more difficult to negotiate with a camper. Would appreciate any suggestions from those who have visited those areas.