I did the same comparison and my thinking went as such...
The HRX requires 4 controls to start the mower, the Toro - 2. That is twice the potential failure points.
Two blades? That is twice as many to sharpen.
Honda engine vs Toro Engine?
Is Honda really going to send their best engines to a competitor?
Same specs, same 5 year warranty, Toro motor was $60 cheaper.
I work for an auto supplier and at the time was working on a Honda project so I was a bit biased against them so take the above with a grain of salt. So far I am very happy with the Toro motor.