We have 2 different ones. The bigger one (for the Border Collie) has "Standard 2" written on it. The smaller one has "Classic 1" written on it. I much prefer the "classic 1" for my Yorkies because it is plenty big for them and it is comfortable for my hand. I do not have a problem fitting 4 fingers into it. It also feels lighter, which I preferred. Betty (Miss 9 1/2 lb Teapot
) runs and pulls when it reaches it's full 16 ft. Sometimes it's a jolt, but it handles her fine. Little Juju is like a feather on the end of it
If you are both more comfy with the larger one, then I'd get that one. But if you feel comfy with the smaller handle, I'd get one of each. The smaller one feels a lot lighter but is ample for your babies!