I only use thin solder when soldering components (0.8 mm)
I never USED to be a big fan of thinner solders - preferring to use 1mm BUT lately I have been using 0.8mm from WES (made in Taiwan) and it is better than anything else I have ever used. Proper FULL lead count and excellent flux....lead free solder is just wank....a bit like McNuggets, Chicken nuggets without containing any chicken - - - now that is 100% McWank