We sell remote collars that range from really small-sized transmitters (
E-Collar Technologies ET-300-A) to the largest on the market (
Garmin Trashbreaker PRO). We also have many sizes in between.
Some folks like them small. Some folks like them big. It really depends on the user.
I tend to decide what features I want and then I get the smallest transmitter I can without losing any of these features.
As a general rule I do not care for really small transmitters. They tend to be hard to find on a hunting setup, but this varies from person to person.
Small transmitters can also be hard to operate if you have large hands or wear gloves when you work your dogs.