I think comparison among several providers for trips is to compare what you get for the money. Many tours do not include air fare to the departure or meeting city (if stateside). Another is numbr of meals included, tours provided with the price, kind and type of optional tours. Also compare airport transfers, and program directors (sometimes you can read bios on them. I spoke with a YMT tour agent for quite a while, reviewed her itinerary for a trip we wanted, and found it very lacking. This was a tour to Canada and New Englande. I compared it to GCT's very similar tour (Maritimes). GCT would have been less expensive and more meals were included with GCT.
A few years ago after 6 trips with GCT to Europe, we didn't see an Alaska tour (early enough to get a good cabin). We booked with World Wide Country Tours. The price was comparable to a GCT Alaska cruise/tour with Norwegian Cruise Line. The only thing I didn't like was that we didn't get a chance to pick the cabin and we had bongo drums above us for the 3 nights on board. We said, oh, well, it's only 3 days.
The program director was very good, but the friendliness, caring, and spontaneous not to mention knowledgeable of all places visited was not experienced with WWCT.