No one can know than in advance, but it will also depend on what resistance fascism will find itself opposed to.

Will it find an unorganized working class where half of them expect an elected saviour and another part of them fight against fascism without fighting against capitalism and towards revolution? Or will it find an organized working class with a strong vanguard party that has the ideological preparation, the ability to reach out to them, strong and massive unions, etc?

This is not the whole part of the equation but it is one that relies mostly on us. It is our job to organize the working class and get them to unite under a common direction, and more importantly to provide them with a realistic and necessary alternative to capitalism without expecting it to arrive magically but through every day collective action. Fascism gains ground where there doesn't seem to be a viable alternative to the current system, when people have been too propagandized to ever consider a revolution as a possible alternative and there's no force saying otherwise effectively, so they fall into the populist magic solution bullshit that fascists provide in an attempt to see real change in the system.