Rear mounts are not brand or model specific so that eventual resale is much surer.
My observation is that rear units are generally much more HD as well.
Careful observation is that the many, even not most, of the front mounts use standard 'walk behind' components notably the cast aluminum gear box and flighting (auger).
Generally limited to smaller CUTs.
Another observation is with that the front overhang makes it very difficult to work in tight spots and the turning radius is awful while a rear has a very good visibility and excellent turning radius.(think fork lift trucks).
Obstructions are totally hidden from view due to distance and angles. When you blow forwards and turn you are pushing snow sideways due to the long swing.
On rough roads the ride is terrible due to the long overhang.
(I have some experience with a front mount 72" on an 80 hp tractor and hated it)
With the advent of low priced back up camera systems (like $50-100) the sore neck syndrome can be eliminated.
Another point is tractors, in most cases, are designed for rear mounted implements as all they were generally designed for farming.
For a pull type to be effective you need a heavy tractor (like 75hp class) as lighter units would ride up and over the snow. eg something heavy enough that the wheels stay in contact with the road surface no matter the type of snow.
IMHO pull types were really designed for urban 'door to door' snow contractors.