Final answer:
To find the best region for growing plants that favor high humidity and precipitation, GIS is the most comprehensive system because it can integrate multiple climate and environmental factors, unlike the more focused data from soil analysis and the limited scope of plant hardiness zone maps that do not consider humidity.
Step-by-step explanation:
When determining the best region to grow a plant that favors high humidity and high precipitation but is hardy in a range of temperatures, a Geographic Information System (GIS) would provide the most reliable information. GIS can analyze and integrate various data types, including climate data and soil characteristics, to help identify suitable regions for specific plant cultivation.
Soil analysis is useful but is more focused on the soil composition and nutrients. Climate modeling can predict climate patterns but might not provide the specific localized information needed. Plant hardiness zone maps offer information on temperature ranges but do not usually include details on humidity and precipitation.