For tin/lead, I prefer the eutectic 63/37 over 60/40. Eutectic formulas change state almost instantly.
My favorite solder is 0.8mm Kester SN60PB40 #66/245 (Organic Flux) - No Clean
I have used it for the last 22 years in manufacturing and in the DIY hobby. I won't use anything else!
Regards
Peter