If you are going to many places or events, then a model that collapses easily and fits into a compact carry case will be useful.
Also, do not forget about the stability features like weight bags or stakes; these are important for securing your canopy against surprise winds.
Canopy selection is size critical because it impacts functionality, design appeal, and space requirements. The first thing to do is to determine the purpose of the canopy; be it for a barbecue, backyard market stall, or a wedding reception.
Differing situations will demand different dimensions; a family gathering would need a 10x10 foot structure while other larger gatherings will need wide canopies that have provision for seats, tables, and even space for dancing.
Think about the space where the canopy will be placed. It's not only about spatial fit but also how it compliments the natural landscape and other structures.
You should also look out for special requirements within the area like restrictions on the height of the canopy or permit requirements for larger installations which are common in some places.
Consider all of your requirements as well as the space available to you so the selected canopy is able to provide physical comfort while improving the environment of the event.