You should also write to the cheaper company. Or was the lesson supposed to be that writing meaningless platitudes like 'race to the bottom' is good marketing? Perhaps it is, but personally, I would feel insulted.

There's no worse assumption that cheaper product is worse, especially when it comes to SaaS. What if FooCorp has automated much more than Acme, and even with lower prices actually has both better profits per sale and better functionality?

Sure, FooCorp should work on their marketing, but that's in their interest, not yours. A perfect company from the customer's PoV is one that is almost unknown, provides the best value per money unit, and has just enough customers to be alive. Then you have a competitive advantage over competition using popular and expensive solutions.