The choice of flux used is probably more important. Aggressive fluxes are easier to solder with, but leave behind a acid residue which can be problematic for el

The choice of flux used is probably more important. Aggressive fluxes are easier to solder with, but leave behind a acid residue which can be problematic for electronic circuits. Fluxes preferred for electronic applications are the least acid, but not as easy to to get the liquid solder to bond.