Answer
Start by comparing the option against the practical details that will affect the experience, not just the headline price or a few attractive photographs. For tour companies, confirm licensing, insurance, boat or vehicle type, guide ratio, group size, pickup, inclusions, meals, park fees, safety equipment, cancellation and recent operating information.
Compare the exact trip rather than the destination name alone. A lower price may reflect a larger group, fewer inclusions or different transport and cancellation terms.
Ask for the important points in writing before paying or making a firm plan, especially anything involving availability, safety, deposits, inclusions or cancellation. Current operating details can change with the season, weather and staffing.
A reliable provider or organiser should be willing to explain what is included, what is not included and who will take responsibility if plans change.