lead free solder often looks shinier because it can contain silver and it generally has a higher melting point than leaded. Dont be fooled into paying more than you have to though. Maplins or Rapids gear will be just as good as RC branded stuff.
If you are melting joints during racing then you have serious overheating problems as leaded solder melts at around 200 degrees C and lead free around 220 degrees C.
As said above though by other posters, leaded is plenty good enough.
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