Both of these teams break one of my cardinal rules. Spelling out the name in the primary logo. There's no need. It should be obvious which teams these are simply by the elements (i.e.: the leaf and the lightning bolt). That aside, the Lightning gets the edge for its use of color.
If Lightning struck a maple tree, all the Maple Leafs would go up in flames.
Both teams are very aptly named. The leaf featured on the Canadian flag is used on a different color and Tampa, Florida is deemed by some to be the lightning capital of the world. The Maple Leafs logo has been around forever while the Lightning has only been around 15 years. The Maple Leafs has proved staying power but silhouette logos are too easy.