For the normal few snow falls and normal driveways a rear unit might work fine and dandy.
But when you have major snow storms multiple times a year and a 1/2 mile or more to do, a three point blower is a real work out on the body!
I know, I have one, and it not only kills my neck, but also my back.
I'm with NIW on this one... Here in the Ottawa Valley we get lots of snow. This winter I had several days where I logged between 6 & 8 hours in a single session on the tractors, here and at the airport. In January I logged over 25 hours on the airport tractor alone. I've done the same thing with rear-mount blowers for the last 25 years, but a couple of years ago got my first front-mount, a B2782B on my first B7510 with a cab. While I still have one of my MF-135's and its rear-mount blower, it is my "standby" in case one of my Kubotas breaks. The Kubotas, with their front mount blowers, now fall into the category of tools that you can take from me "when you can pry them from my cold, dead hands."
While one of my three B-series tractors has a FEL, it gets put away for the winter. Yes, it would be handy to have for moving firewood etc, but not nearly as handy as having a front-mounted blower for all those hours of moving snow.
Since we get a good amount of snow, I simply will NOT push snow, no way, no how. Pushing snow is a totally lost cause as it produces windrows that are higher than the surrounding area. Get a bit of wind and now your driveway or roadway is filled with a drift that's as deep as the windrow is high. Instead, blow the snow way the heck and gone out into the middle of the yard or the bush and be done with it. If you get snow blowing around, the drifts will only be as deep as the surrounding snow, making the next round of snow removal far easier.
I've had five tractors with rear-mount blowers, including two B-series Kubotas, one of which, a B7200HSD, I sold with its rear-mount blower. Now I have converted all three of my remaining Kubotas to front-mount blowers and there is simply no way I'm going back. Yes, I have kept a 51" Meteor rear mount blower that I could install on any of my three B-series tractors as a "just in case", but I really, really don't want to use it.
If you have any appreciable amount of snow to deal with, backing up is just plain backwards. Do it for a few hours, non-stop, and then tell me you're not sore!
Oh, by the way... If buying a front-mounted blower, it's not mandatory to get the hydraulic chute rotator. One pf our fine OTT members suggested using a power seat motor to replace the manual crank on a front mounted blower. I followed his recommendation and am extremely pleased with the outcome. One of my blowers has the hydraulic rotator, and it works well, if perhaps a little too fast for precise placement of the snow. The power seat motor allows me to precisely rotate the chute as I advance the tractor so I can put the snow in a pile if I wish. I'm really pleased with this modification.
All three of my front-mounted blowers use linear actuators to control discharge chute deflection. This, too, is an inexpensive modification that's very worth doing.