You must know that this referendum was approved without reading the bill in the Catalonian parliament, so the opposition couldn’t even have a say. Even the vicepresident of the chamber stepped out of line since it was so outrageously un-democratic. The people leading this movement in Catalonia (very much like the central government) is riddled with corruption. Public workers have been pressured to accept participation in the referendum (which is ilegal to do).
And just to finish: if you’re going to reference any prior “referendum” know that it’s not only ilegal like this one (thus no observers, nor accurate census) but also take into account participation (usually very low).
In short: please be skeptical about whatever you hear from either side. There’s an estimated 40-45% of support for the vote and less than that (30-40%) support for independence.