Nicholas123
N/A
Pound for Pound I can get "Teak oil" cheapest at Wicks (according to their website) but which is best & is there any real difference? 
Teak oil in chandlers contains Linseed oil that turns teak black with UV damage. Make absolutely sure that the teak oil in Wicks has no Linseed oil in it, if it's cheap it probably does. Pure teak oil is expensive but worth it.
Wood skin is better imo
None of it for use on a boat! Finish you brightwork with the proper stuff as sailorman suggests and forget about it for 5 years.