The best option is a front mounted blower,
Not sure I agree with that as a universal assessment. I have both and prefer the 3ph mounted blower overall.
Yes, the front blower minimizes looking behind. But there are some significant disadvantages too:
1. Cost. A front mounted blower will cost roughly twice as much after adding in the specific mounting hardware.
2. Availability. Pretty much limited to Kubota due to the required mounting hardware; generally only available for current models. Used examples are rarer than a used FEL.
3. Lighter construction. This is not universal, but certainly tends to be the case for smaller tractors. The 3ph can take the weight of thicker steel.
4. Poor steering in deep snow. Any blower will have a rudder effect in deep snow, but the steering wheels have a lot more leverage against a 3ph mounted unit. Putting that rudder forward of the steering wheels means your first pass better be a straight line.
5. Vibration (specific to the B7100 but may be the case with other models too). The forward PTO spins at something like 2,500 rpm instead of the sedate 540 of the rear PTO. It's like sitting on a vibrator.
If you have a cab, some people report a back-up camera can be used with a 3ph blower. I haven't tried it myself but it could be an option.