I did some research on the beam divergence of all three units once. Plus I have used all 3 in the field.
Here are the size of beam of each unit at 1000 yards.
Leica.... .5 x 2.5 m rad. or a 1 1/2 ft tall by 7 1/2 ft wide beam at 1000 yards.
Swaro.... 2 m rad in all directions or a 6 ft circular beam at 1000 yards.
Zeiss..... 2x4 m rad or a 6 ft tall by 12 ft wide beam at 1000 yards.
This info will be more usefull if you plan to use the unit on flat ground. Pretty easy to see which one will be more precise at returning accurate numbers of exactly what you need the range on.
Hope this helps.