Personally I'd buy neither, they aren't known for being very durable. Try
Corrosion Protection - Rust Removal - Car Wax - Car Polish - Bilt-Hamber UK, they sell auto-clay (a massive clay bar) and auto-balm which is a very durable wax. Alternatively another favorite of mine is Autoglyms Super Resin Polish complimented by their Extra Gloss Protection.