Hi Gareth, and welcome to the forum.
Of course we are biased... but there is little similarity between Corns and Garters.
Garters are active, inquisitive, intelligent and full of character. When you have Garters there is always something going on, always movement and action. You don't have those long days of an apparently empty tank, as you do with so many other popular snakes.
Garters are just plain 'interesting'. Get some. Enjoy!