Looking at vacation tours to Alaska and wondering how to choose. We are trying to decide between a Knightly escorted National Park tour that starts and ends in Anchorage, includes Kenai fjords tour, and two nights in Denali. Or a Greyline escorted Great Land tour that starts in Anchorage and ends in Fairbanks, it includes Kenai fjords tour, two nights in Denali. Both include travel by motor coach and some by train - prices are similar. Any recommendations?