Some observations:
Many chutes are tapered and I'd suspect it is to increase the velocity therefore distance.
I guess that allowed for smaller lighter frames.
Problem there is that 'choke' creates jamming especially in wet heavy snow events.
Then comes the fan, smaller = cheaper to build as is the number of blades.
3 blade fans will cover a wider range of HP requirements but push less snow.
4 blades and wider fans is the all around better blower.
Then comes the metal gauge, thicker = HD.
Most manufacturers have 2 brands, one = HD commercial while the 2nd is consumer grade.
Another 'grade' is the many front mounted for smaller 'rider' or mower type machines.
Close examination will show that lots of components are borrowed from the Toro/Arians family of blowers.
Not very HD but do a reasonable job for the homeowner.