Subsistence farmers weren't cramped in filthy disease ridden workhouses, getting paid in company scrip, getting mangled by machines (OK they were but probably not as often) or being locked into burning buildings because preventing theft of stock was more important to owners than the lives of employees. And subsistence farmers owned what they produced and the means by which it was produced, whereas industrial workers owned nothing but the pennies in their pocket, and likely owed more than that to the company.
It took years of often violent protest for workers to return to even the basic level of dignity and rights once afforded to craftsmen and farmers. Not that the lives of subsistence farmers and craftsmen were good, but they were better than what the dehumanization of mass production and automation created.
But then comparing farmers and workers in this context is a bit specious. It would be more fair to compare, say, textile workers before the automated loom and textile workers after. Obviously the former had it much better off, which was precisely the problem automation was intended to solve.
The dream then was to go to America and become a farmer and OWN your own farm. No one dreamt to immigrate to America to work in the industrial factories.
Why was that the American dream at the time if farming was the worse option?