Gas logs are generally used to provide the burning effect that is seen when pieces of wood are burnt in the fireplace. They are generally showpieces are designed to provide heat for a limited period of time.
Gas logs are meant for you to witness heat of a beautiful burning fire without the necessity of you cleaning up the ashes and dirt after the fire goes off. They also save you the instance of toting wood from your shed to your fireplace. This option goes well if you have multiple fireplaces in your house. However gas logs are not meant for prolonged heating as they will generally end up fumigating your room space if left on for a prolonged period.
A canopy is a shelter that is designed to protect both man and beast from the harsh elements of weather. These contraptions are made using the highest quality materials and are available in various colors ranging from red, black, and blue to purple. The materials used to build such canopies are water proof and light weight thus enabling them to be carried around wherever they need to be set up.
In short a canopy will help you protect you and your guests from the sun, the wind and rain as and when the need arises.