What you really want is a connector plated the same as the connector you're connecting it to. If it's tin-plated, use a tin-plated connector. If it's gold-plated, use gold. What I don't know of is any tin-plated cables which include a sacrificial zinc anode. In motoring (and presumably other places with metal bolted to metal) we use zinc anti-seize where dissimilar metals meet because it gets eaten up first, which is handy. I'm not sure if that applies to tin, though. Also in motoring, tin is what's used as an intermediate between steel or copper and aluminum.
Tin is used for solder but in alloys which reduce whiskering, but you certainly don't want pure tin or zinc used for your connectors with tons of very close signal lines because both of them have issues with whiskering which can lead to shorts... especially at points where mechanical stress can occur (flexing of the connection).