Because they're smaller, they freeze better too (less water content inside) which makes them great for baking. (runningtothekitchen.com)
If you're using a cucumber that has a very waxy or bitter skin, you can certainly peel them first, but if you can find the English ones I recommend those, as they have less water content and won't water down the dressing as much. (willcookforfriends.com)
They actually have less water content than garden cucumbers, and their skin is sweeter and less waxy so there's no need to peel them. (willcookforfriends.com)