There's no way for me to answer your question about your boat. You have to spend a little time and effort to determine which propeller will perform the best for your boat.
You need to do three things to answer this question: (1) Read the article and make notes so you understand what the guy at the boat parts place is talking about. (2) Read the part of your boat's manual which tells you about your motor's rating, the recommended propeller diameter, pitch, and slip. And (3) visit the parts store and tell the parts guy whether you are looking for more speed, more torque, more durability, or more maneuverability.
Those four factors and what you learn from your boat's manual will help you and the parts guy determine the diameter of the prop, the pitch, and the effect of slippage of any given prop.